Back up iCloud-only photos to a USB drive
If "Optimize iPhone Storage" is enabled, your iPhone keeps lightweight versions and leaves the originals in iCloud. AmberTime can fetch each original from Apple first, then write the full-resolution file directly to your USB drive or external SSD.
Quick answer
Open the Photo Library backup task in AmberTime, enable the option to include iCloud-only originals, and start the backup. AmberTime asks iOS to make each original locally available, waits for the download to finish, then writes the full file to your drive. Files that are already local are written immediately.
What "iCloud-only" actually means
iCloud Photos stores your originals in iCloud and syncs them across your Apple devices. When iPhone storage is tight, the "Optimize iPhone Storage" setting lets iOS keep a smaller, device-resolution version locally and offload the full original to iCloud.
From the user's point of view, the photo still appears in the Photos app and looks the same. Under the hood, the original file is not on the iPhone yet. Some apps that scan local photos see only the lightweight version, not the original. That is the gap AmberTime explicitly handles.
How AmberTime handles iCloud-only originals
For each item in a Photo Library backup task, AmberTime checks whether the original resource is locally available through iOS PhotoKit:
- If the original is local, AmberTime writes it directly to the drive.
- If the original is iCloud-only and you opted in, AmberTime asks iOS to make the original locally available. iOS contacts Apple's iCloud, downloads the original to the iPhone, and notifies AmberTime when the file is ready.
- AmberTime then writes the just-downloaded original to your drive, just like any local file.
The same flow applies to Live Photos, RAW + JPEG pairs, ProRAW, and ProRes resources where iOS exposes them.
Where the data flows (and where it does not)
The download path is Apple iCloud → iPhone → your USB drive. AmberTime sits between the iPhone and the drive, not between the iPhone and the cloud. There is no AmberTime server in the path.
- AmberTime does not have your iCloud credentials.
- AmberTime does not see your photos in transit.
- AmberTime does not upload anything to AmberTime servers, with or without iCloud-only enabled.
- The only network traffic is Apple's normal iCloud download, which iOS performs with your existing Apple ID.
Tips for large iCloud-only libraries
| Concern | What to do |
|---|---|
| Network | Use Wi-Fi for large runs. Cellular downloads work but eat data quickly when originals are 4K or RAW. |
| iPhone storage during the run | iOS may temporarily cache originals while AmberTime is writing them. The drive is the durable copy. iOS will reclaim space later if Optimize Storage is on. |
| Time | The first run that includes iCloud-only items is the slow one. Later incremental runs only fetch what is new since last time. |
| Battery and heat | Keep the iPhone plugged in for long runs. Sustained iCloud downloads plus drive writes are real work for the device. |
| Failures | Items that fail to download are recorded as not-yet-completed. Run the task again on a better connection and they will be retried. |
What about later cancelling iCloud?
Once originals are written to your USB drive, that copy is yours and stays on the drive. Cancelling iCloud Photos or downgrading the iCloud plan does not affect files already backed up. The drive can be opened later from any computer to recover originals.
If you plan to cancel iCloud, run a full AmberTime backup with iCloud-only enabled first, verify the drive contents, and only then change your iCloud plan.
FAQ
Does AmberTime upload my photos when fetching iCloud-only originals?
No. The download is between Apple's iCloud and your iPhone. AmberTime never sends your photos to any AmberTime server.
Do I need an iCloud subscription to keep the originals?
The originals only need iCloud while they are in iCloud. After AmberTime writes them to your drive, the drive copy is independent of iCloud. You can change or cancel iCloud later.
What if some downloads fail?
Failures are recorded and retried on the next run. AmberTime does not silently skip items.
Will the photos still take iPhone storage after backup?
iOS manages local storage for iCloud Photos. With Optimize Storage enabled, iOS can offload originals again later. Your USB drive copy is not affected.