Notes on backups you actually own.

How to Back Up Android Photos to a USB Drive

Android can copy its own photos to a USB drive with no computer involved, and its browsable filesystem makes it easier than iPhone. Where your photos actually live, both methods, and the quirks worth knowing.

How to Back Up iPhone Photos to a USB Drive Without a Computer

You no longer need a Mac or PC in the middle. What you need, how to format the drive, both ways to do the transfer, and how to tell whether the backup actually worked.