My iPhone 16 with 256GB of storage was damaged, so Apple replaced it with another 256GB model. I avoided buying additional cloud storage and instead created a local backup of the damaged phone on my Windows laptop using the Apple Devices app. After several attempts, I thought I had successfully backed up nearly all of the phone's 249GB of data.
When I tried restoring that backup to the replacement phone, I received an error saying there wasn't enough storage. After setting up the replacement temporarily, I noticed that around 90% of its capacity appeared to be listed as System Data. I erased it and tried again, including attempting the restore directly from the Hello screen, but the computer still reports only about 240GB available on the 256GB phone.
I also noticed that the replacement phone had to be updated to a newer iOS version before the restore. Could the newer iOS be using significantly more space? Is the backup too large, or might the Apple Devices app be retaining multiple failed backups? I'm considering third-party tools for a selective restore but would rather avoid them unless they're safe and necessary. What should I check or try next?
2 Answers
About 240GB of usable space on a 256GB iPhone is normal. The advertised capacity and the capacity shown by iOS are calculated differently, and the operating system takes some room, so that doesn’t indicate a defective replacement phone.
The bigger question is whether the 249GB figure is really the size of one backup. The Apple Devices app can leave multiple backup folders behind after failed attempts. On Windows, check the individual folders under the Apple backup directory in AppData rather than judging the size of the whole parent folder. Also, a backup is usually smaller than the phone’s used storage because app installations themselves aren’t included and are downloaded again later.
The huge System Data reading was probably leftover data from the incomplete restore and should disappear after erasing the phone. Restoring while the phone is still on the Hello screen is the correct method. I’d avoid third-party recovery or selective-restore utilities unless absolutely necessary, since they require access to a complete copy of your personal data.
A 217GB backup may still be too large for a phone that has only about 240GB available. Although backups don’t include every app binary, restoring can require additional temporary working space while the data is unpacked, indexed, and converted. The backup size also isn’t always a direct measurement of the final space used on the phone.
Try restoring the one confirmed backup from the Hello screen after making sure the phone is fully erased and updated. If it still fails, ask Apple to verify the backup and replacement device rather than relying on an unfamiliar third-party tool. As a last resort, restoring onto a higher-capacity phone first and then transferring the contents could work, but it would involve buying or borrowing another device and carefully staying within its return period.
I found two backup folders and deleted the older one, which came from a failed attempt. The remaining successful backup is about 217GB. I hadn’t realized the app might keep separate failed backups, so that helped explain the confusing storage numbers.