I have two GrapheneOS phones, and some data on one I’d like to transfer to the other.
For reasons beyond my control, the devices cannot use any wired or wireless network. So I need to use an external USB drive.
I want no unencrypted data on the USB drive. So:
- Does GrapheneOS support formatting/mounting encrypted partitions on an external device? If so, how?
- If encrypting the drive is not an option, what trustworthy apps are available (in GrapheneOS or some external source like F-droid) to encrypt files so they can be securely transferred over an insecure medium, like an unencrypted USB drive?