One home for your photos: a library app, folders, or both
Choose one master library that everything else is a copy of, check that it keeps your full-size originals, and know what your phone's space-saving setting removes before you turn it on.
- Start here: the essentials
- One master library, and everything else a copy
- Three shapes: an app library, folders, or both
- Check that it keeps originals
- What the space-saving settings remove
- Sync is not a backup
- Two people's photos in one place
- Write the choice down
- App against folders, Mac referenced files and the Apple to Google transfer
- See it: Nadia and the Okafors
- Practice: name the master library
- Your photos
- Check your work
- Knowledge check and scenario
Start here Essentials
For a first pass, this chapter asks you to name one place as the master library, confirm it keeps full-size originals, learn what your phone's space-saving setting removes, and write all three on the plan sheet. Nothing is moved or deleted here.
- Decide which one place is the master library. Usually the app library you already use, or folders on a computer or drive (three shapes).
- Check that it keeps originals. Original quality in Google Photos, iCloud Photos (which stores originals), or full-size files in folders (check that it keeps originals).
- Read what your phone's space-saving setting does before you turn it on. Optimize Storage and Free up space remove different things (what the settings remove).
- Write the master library, its quality setting and why on the plan sheet. The sheet becomes the written description of your library (write the choice down).
Minimum time: about 30 minutes with your phone in hand. Done when: the plan sheet names the master library and its quality setting.
One master library, and everything else a copy Understand
The master library is the one place you treat as the real collection. New photos go into it, sorting and captions happen in it, and every other place is either a source you are emptying into it or a copy made from it. The choice matters less than having made it: two half-libraries on a phone and a laptop, each with photos the other lacks, are how photos get missed when a device fails.
Three words recur through this manual.
- An original is the file as the camera or scanner made it, at full size, in its own format. Edits, smaller versions and converted copies are not originals.
- A copy is a second, independent file of the same photo, somewhere else. Deleting the original does not delete a copy.
- A version is a changed form of a photo, such as an edit, a crop or a smaller sharing size. Apps often keep the original and show you a version.
The Library of Congress's guide puts organizing after identifying and deciding: make a folder structure and write a brief description of it (Library of Congress, Keeping Personal Digital Photographs). Choosing a master library is the first part of that step, and the plan sheet is where its description lives.
A master library is one copy. It is not, by itself, a way of keeping photos safe. Sync is not a backup, below, explains why, and Backups is where the second and third copies are made.
Three shapes: an app library, folders, or both
A master library takes one of three shapes. None is right for every household; what you already have and how you use photos decide it.
| Shape | What it is | Keeps originals? | Needs a computer? | What it asks of you |
|---|---|---|---|---|
| An app library that syncs | iCloud Photos, Google Photos or another service, seen on every device you sign in to | iCloud Photos: yes. Google Photos: only in Original quality | No | A paid plan once the library outgrows the free amount; checking the quality setting; separate backups |
| Folders on a computer or drive | Plain folders of files, named by date | Yes, if what you copy in are originals | A computer, or a phone that can write to a drive | Copying new photos in by hand; a folder pattern (Folders and file names) |
| Both | The app for daily viewing; folders of exported originals as the archive | The folders hold them | Usually | Exporting on a routine, so the folders keep up with the app |
An app library
An app library is what most phones set up for you. It is the easiest to keep current, because new photos arrive by themselves, and it can be searched by place, date and face. Its costs are a subscription once the library outgrows the free amount, dependence on one company's rules, and a sync that carries deletions everywhere.
Folders of files
Folders are the shape archivists describe. The Library of Congress's guide asks for a directory structure and a description of it. The UK Data Service's guide on structuring folders asks you to keep source files in a folder of their own, apart from working copies, and to keep a short readme at the top that explains the folders and the names (UK Data Service, Structuring folders and directories). Any computer can open a folder of JPEG or HEIC files without the app that made them, which is why folders suit an archive. Their cost is effort: nothing arrives in them unless you put it there.
Both
The third shape uses the app for what it does well and folders for what they do well. Photos arrive in the app; once a month or once a season, you export the new originals into dated folders on a drive. The folders become the archive and the source for backups. This is the shape most of the archivists' advice assumes, and it needs a computer or a phone that can write to a drive.
This manual's default: if you have no computer, the app library you already use is the master, checked for originals; if you have a computer or a drive, add folders of exported originals when you set up backups. Our default Your exception is your own setup: a household that already keeps dated folders on a computer can make those the master and treat the phone's app as a source. Go deeper sets the two side by side.
Check that it keeps originals
A library that keeps smaller versions instead of originals cannot give the originals back later. So before you call a place the master, check its quality setting. This is the most common way a cloud library ends up holding less than people think.
| Library | Setting that keeps originals | What the other settings do | Where to look |
|---|---|---|---|
| iCloud Photos | Apple says iCloud Photos stores photos and videos in their original formats at full resolution | Optimize Storage changes what is on the device, not what is in iCloud (below) | iPhone: Settings > [your name] > iCloud > Photos, Sync this device on |
| Google Photos | Original quality: the same resolution you took them at, no change to quality | Storage saver compresses photos, resizes those over 16 MP to 16 MP, may convert them to JPEG, and resizes video above 1080p to 1080p. Express, in some regions, resizes photos to 3 MP | Profile picture > Google Photos settings > Backup > Photos & videos quality; the setting is per device |
| Amazon Photos | Amazon says Prime members get unlimited full-resolution photo storage | Videos count toward a 5 GB limit, Prime or not | Amazon Photos app, Profile, then Storage |
| Folders | Files copied as originals (on iPhone, Export Unmodified Original) | An ordinary export or a converted copy may be smaller or a different format | Getting photos out |
Sources: Apple, Set up and use iCloud Photos (published September 14, 2026); Google, Choose the backup quality; Amazon, How much storage do I have. Product-specific
What Google's settings mean for old backups
Storage saver was called High quality before. Google says items backed up in it before June 1, 2021 do not count toward storage, and that you can't change the setting while the account is out of storage. Changing the setting affects new backups only. A photo already backed up in Storage saver stays compressed in the cloud; the full-size original exists only where it was taken, if it still exists there. That is why an old phone that backed up in Storage saver can hold the only full-size copies of its years (Taking stock marks it; Getting photos out copies it).
Other services
OneDrive's and Dropbox's camera uploads copy the phone's photos into a folder in the service. The pages we read describe the upload and do not state a quality setting for photos, so check one uploaded photo's size against the phone's copy before treating either as the master. Test it
What the space-saving settings remove
When a phone fills up, it offers to make room by keeping less on the phone. Each setting removes something different, and the difference decides where your only full-size copy ends up. Read the row for your phone before you turn anything on.
| Setting | What stays on the device | Where the full-size photo is afterwards | What to know first |
|---|---|---|---|
| Optimize iPhone Storage (iCloud Photos) | Space-saving versions, starting with the items you open least | In iCloud only | Apple says it is on by default with iCloud Photos |
| Download Originals to this Mac (iCloud Photos on a Mac) | Full-size originals | On the Mac and in iCloud | The other choice, Optimize Mac Storage, keeps smaller versions |
| Free up space (Google Photos) | Nothing for the items it removes; items under 30 days old may be kept | In Google Photos, at the quality they were backed up in | Google says the feature deletes photos from your device |
| Files On-Demand (OneDrive on Windows) | Placeholders that take no space and do not open offline | In OneDrive | On by default in current versions; Always keep on this device makes a folder real files |
| Amazon Photos with Prime | (Not a phone setting) | In Amazon Photos | If Prime ends, the account keeps 5 GB free, and content over the limit must be removed |
Optimize Storage on an iPhone keeps a smaller version of each photo on the phone and the original in iCloud. Apple's path in iOS 27 is Settings > [your name] > iCloud > Saved to iCloud > Photos > iPhone Storage > Optimize Storage; in iOS 26 or earlier, choose Optimize Storage on the Photos screen (Apple, Set up and use iCloud Photos). Apple's storage page says Optimize is on by default when iCloud Photos is on (Apple, Manage your photo and video storage, published October 1, 2026). Apple does not say what resolution the phone's versions are. The result is that the phone no longer holds the originals: iCloud does. If iCloud is your master library, that is one copy of each original, in one place.
Free up space in Google Photos deletes the phone's copies of photos that are backed up. Afterwards Google says you cannot see them in the phone's own gallery or offline (Google, Free up space on your device). What is left is the cloud copy at whatever quality it was backed up in. If that was Storage saver, the full-size original is gone.
A placeholder file is an icon that stands for a file kept online. Microsoft says online-only OneDrive files take no space on the computer and can't be opened offline; right-click a folder and choose Always keep on this device to make them real files (Microsoft, OneDrive Files On-Demand). A backup program that copies a folder of placeholders may copy icons rather than photos; Microsoft's page does not discuss backup programs, so that is our reading, and Backups has the check.
The safe order, before turning any of these on: make sure there is a second copy of the originals somewhere else, then turn the setting on. That order is this manual's; the makers describe the settings, not the order. This manual's rule The My phone is full page puts it on one page.
Optimize Storage and Free up space both leave the full-size photo in one place, the cloud. A space-saving setting is not a backup, and turning one on with no other copy makes the cloud library the only copy.
Sync is not a backup
To sync is to keep the same library the same on every device: add a photo on the phone and it appears on the laptop; delete it on the laptop and it disappears from the phone. A backup is a separate copy that does not change when the library changes, so a mistake in the library does not reach it.
The makers say this plainly. Apple says that deleting a photo on one device deletes it everywhere you use iCloud Photos, that Recently Deleted keeps it 30 days, and that items in iCloud Photos are not duplicated in your iCloud backup, so you should keep backup copies of your library (Apple, Set up and use iCloud Photos). Apple's Mac guide adds that even if you use iCloud Photos, you should back up the library locally (Apple, Back up your photo library on Mac). Apple's storage page says that when you are over your iCloud storage limit, deleted photos are removed at once, with no Recently Deleted period (Apple, Manage your iCloud storage). Google says deleting in Google Photos removes the item from all devices with backup on, and that the trash keeps it 30 days (Google, Delete photos & videos). Product-specific
So a cloud library and the phone it syncs with count as one library. They protect you against a lost phone. They do not protect you against a deletion, a mistaken setting or a closed account. That is the job of Backups, which starts from this point; Learn Digital Security's Backups chapter covers backing up whole phones and computers.
| What happens | Synced library (iCloud Photos, Google Photos) | A separate backup copy |
|---|---|---|
| Phone lost or broken | Photos still in the cloud | Photos still on the backup |
| You delete a photo by mistake | Deleted everywhere; recoverable for about 30 days (less if iCloud is over its limit) | Still on the backup |
| The account is closed or deleted | Gone with the account | Still on the backup |
| A setting leaves only smaller versions | The cloud copy is what was uploaded | Whatever the backup copied |
Two people's photos in one place
Couples and households often want one library. Two maker tools do this, and both change who controls what. Product-specific
Apple's iCloud Shared Photo Library lets up to six people share one library, separate from each person's own. Apple says all participants can add, edit and delete, that the person who creates it provides the iCloud storage for all of it, and that you can join one Shared Library (Apple, How to use iCloud Shared Photo Library, published September 17, 2026). It needs iOS 16.1 or later with iCloud Photos on. Because everyone can delete, it is a shared master with shared risk, and it needs a backup like any other library.
Google's partner sharing shares one person's photos with one partner, all of them or chosen face groups, from a start date. Google says only backed-up photos are shared, that photos your partner saves do not count against their storage as long as you keep sharing, and that your later edits and deletions do not reach copies they have already saved (Google, Set up partner sharing). It is a way to see each other's photos; it is not a merge of two accounts.
If one partner's account is the master, write which on the plan sheet. If the other account is over its limit or unused, it is the one at risk under the rules in Taking stock, and its photos are the first to bring into the master. Sharing albums with family outside the household is in Sharing photos.
Write the choice down
The plan sheet records the decisions this manual asks you to make, starting with three from this chapter: the master library (where it is), its quality setting, and the phone's space setting. Write a reason beside each, in a few words. "iCloud Photos, because it is what the phone already uses and stores originals" is enough.
The plan does a second job. The Library of Congress asks for a brief description of how your photos are organized, and Stanford's library guide asks for a readme that explains a naming scheme (Stanford University Libraries, Data best practices). A readme is a short note kept with the files that says how they are arranged. The plan sheet's print view is that note: print it or export it and keep it with the library, so that someone else, or you in ten years, can tell what the master is and where it lives. Routines and handing on uses it.
This manual does not choose a product or a storage plan for you, and plans change: Microsoft changed its family plan for new subscriptions on October 8, 2026. A cloud library is one copy, not a backup, whichever service holds it. Each setting here is described from the maker's own page on the date we read it; your own app and its current help page are the final word. If a menu does not match, follow your app and write what you found on the plan sheet. Check your own app
App against folders, Mac referenced files and the Apple to Google transfer Go deeper
App library against folders
| Question | App library | Folders |
|---|---|---|
| Who decides the arrangement | The app (by date, place, face) | You (a folder pattern) |
| Opens without the app | Only after export | Yes, on any computer that reads the format |
| Captions and albums | Kept in the app; whether they leave with an export depends on the app | Kept in the files or in a sidecar file, depending on the tool (Dates, captions and people) |
| New photos | Arrive by themselves | Copied in by hand |
| Deletions | Sync everywhere | Stay where you made them |
| Rules that can delete | The service's inactivity and quota rules | None, but drives age (Formats and the long term) |
The archivists' sources (Library of Congress, UK Data Service, Stanford) describe folders and written descriptions; none of them discusses consumer app libraries. The makers' pages describe their apps and, for Apple, say to keep backup copies. "Both" is where those two bodies of advice meet.
A Mac library's referenced files
Apple Photos on a Mac can leave some files outside its library, as referenced files. Apple says referenced files are not backed up when you back up the library, and that you can consolidate them into it (Apple, Back up your photo library on Mac). If you imported from a drive with the option to leave files in place, consolidate before you count the library as the master. Apple also warns against keeping a Time Machine backup on the same drive as the library.
Shared libraries for couples
Apple's page adds detail that matters for a couple. Items you contribute move out of your personal library. If the creator deletes the shared library, people who have been in it more than seven days receive everything, and those in it less than seven days receive only what they contributed. If the creator runs out of iCloud storage, nobody can add, and edits stop syncing. Google's partner sharing notes that date and face filters can mis-share, and date filters fail on scans and on cameras with the wrong clock.
Moving between Apple and Google
Apple offers a service that copies an iCloud Photos library to Google Photos. Apple says it sends a copy and does not change iCloud, takes 3 to 7 days for most transfers and up to 30, and needs two-factor authentication, Advanced Data Protection turned off and enough Google storage. It also says only the most recent edit of each photo is transferred, not the original, and that shared albums, smart albums, Live Photos and some metadata are not transferred (Apple, Transfer a copy of your iCloud Photos collection, published October 9, 2026). So the transfer is a move to a new daily library. It is not an archive of originals; for that, export originals as in Getting photos out.
See it: Nadia and the Okafors See it
Nadia Brooks is a fictional person, and every fact about her here is invented for this manual. Her iPhone (128 GB) says storage is almost full. iCloud Photos is on, with a 50 GB iCloud+ plan holding 46 GB, and Optimize iPhone Storage is off. She has about 7,800 photos and 260 videos. She has no computer. Her inventory (Taking stock) lists an old Android phone, an old Google account, a WhatsApp group and Facebook as other places.
Known: iCloud Photos is on and is the library her phone uses; Apple says it stores originals at full resolution; Optimize is off, so the phone also holds the originals. Her choice: iCloud Photos is the master library. With no computer, folders are not practical yet, and the app library already holds everything from 2019 on. She checks Settings > [her name] > iCloud > Photos and sees Sync this iPhone on.
The space setting. Turning Optimize on would free room on the phone and leave the originals only in iCloud. She decides to leave it off until the drive holds a copy of the originals, and writes that reason down. That order follows My phone is full.
Her plan sheet: "Master: iCloud Photos (my Apple Account). Quality: originals in iCloud. Phone space: Optimize off until the USB-C drive has a copy; then decide."
Assumed: that her plan's 4 GB of headroom lasts until she has copied the library to the drive (her growth over the last year, from the space calculator, settles it). Open: whether to turn Optimize on (Nadia decides after the drive copy in Backups); whether to buy a larger plan (her decision; this manual does not recommend plans); where the 2016 to 2019 photos from the old phone go (into this master, in Getting photos out).
Daniel Okafor (he/him) and Grace Okafor (she/her), both 38, are fictional. Each backs up an Android phone to their own Google Photos account. Daniel's free 15 GB is full and his backup has stopped; Grace has a 100 GB Google One plan. They have about 24,000 photos between them, many from the same events, and a Windows desktop in the hall.
Known: two accounts; Daniel's is over its limit; Grace's has room. Settled here: the master is Grace's account, with partner sharing from Daniel's. Daniel's account is the one at risk: Google says content can be deleted after two years over quota, and a full account takes no new backups. So his photos move into the master first. Grace reads her own backup quality on her phone and writes it on the plan as the app shows it.
What partner sharing does not cover: Google shares only backed-up photos. Daniel's backup stopped when his storage filled, so the photos he has taken since are only on his phone. Under that reading of Google's page, partner sharing will not show them, and they need copying another way (Getting photos out covers the Windows desktop by cable).
Assumed (Grace's): that most of the 24,000 are in one account or the other. Open: how many photos are only on Daniel's phone (Daniel settles it by checking his backup status in the app); how many of the 24,000 are duplicates (Duplicates); and whether photos Grace saves from partner sharing stay hers if Daniel's account is ever deleted. Google's page says saved partner photos do not use her storage while Daniel keeps sharing, and does not say more, so under these assumptions they also keep the files themselves in a backup (Backups).
- Apple, Set up and use iCloud Photos: originals at full resolution, Optimize Storage, deletion everywhere, and "keep backup copies".
- Google, Choose the backup quality of your photos and videos: Original quality, Storage saver and Express.
- Google, Free up space on your device: what the button deletes.
- Apple, Back up your photo library on Mac: back up locally even with iCloud Photos, and referenced files.
Practice: name the master library Practice
Minimum: name the master library on the plan sheet and write its quality setting, read from the device. Time: about 30 minutes. Materials: your phone (and computer, if you have one), your inventory from Taking stock, and the plan sheet.
- Look at the inventory and pick the place that holds the most, the most recent, or both. That is usually the master. Write it on the plan sheet.
- Open its quality setting on the device. iCloud Photos: Settings > [your name] > iCloud > Photos. Google Photos: profile picture > Google Photos settings > Backup > Photos & videos quality. Folders: open one photo's file information and compare its size with the phone's copy.
- Write what the setting says, in its own words. "Original quality", "Storage saver", "Sync this iPhone on".
- Find the phone's space-saving setting and write whether it is on or off. Do not change it today.
- Write one sentence of why. It is the start of the readme.
Check one photo end to end. Take a photo, wait for it to upload, and open it on another device or the service's website. Compare its size or dimensions in the photo's information with the phone's copy. If they differ, the library is not keeping originals, whatever the setting's name suggests. On a Mac, check Photos > Settings > iCloud for Download Originals to this Mac, and look for referenced files before you count the Mac library as the master.
Your photos Your photos
Check your work Check your work
Criteria
- Does the plan sheet name one master library, with where it lives (service and account, or computer and folder)?
- Is its quality setting written as the device shows it, not as you remember it?
- Is the phone's space-saving setting written as on or off, with what it removes?
- Is there a reason beside each choice?
- Does the plan avoid calling the master a backup?
Worked example
Nadia's plan names iCloud Photos on her Apple Account, quality "originals in iCloud", and Optimize "off until the drive has a copy". It passes. It does not say the library is backed up, and it does not pick a storage plan; both are open, and both are hers to settle.
Common mistakes
- Calling the cloud library the backup. Deleting syncs everywhere; Apple says to keep backup copies.
- Assuming Google Photos keeps originals. Only Original quality does; check the setting on each device.
- Turning on Free up space or Optimize to clear a full phone with no other copy. The cloud copy becomes the only full-size one, or the only copy of any kind.
- Two masters. A phone library and a laptop folder that both get new photos drift apart; pick one and treat the other as a source.
- Using Apple's transfer to Google as an archive. It sends the latest edit, not the original.
What is still unresolved
Whether the master is complete depends on copying in every other place and checking counts (Getting photos out). Whether it survives a mistake depends on copies elsewhere (Backups). How the folders are named is Folders and file names. Which plan to buy is your decision, made from the maker's current page.