Companion App doesn't work on privacy-focused Android distributions (CalyxOS, GrapheneOS)

[mrrfv]

Discussed in https://github.com/mrrfv/linux-android-backup/discussions/39

^{Originally posted by onley November 27, 2022}

Does this still work under Android 12? I have tried to perform a backup twice, once using tar export and once using adb export and both times it failed at "Exporting contacts (as vCard)". When using adb export there was also an error message adb: error: failed to stat remote object '/storage/emulated/0/linux-android-backup-temp/.': No such file or directory apparently the companion app is unable to write to the device.

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Report any possible clues regarding this problem as well as workarounds under this issue. Unfortunately I don't have any devices that could run either of these operating systems, so I'm unable to debug this without your help.