Automatic, scheduled exports #103
Description
I keep significant backups of my phone, mainly produced from automatic backup options in apps where available (and Syncthing / Termux scripts to copy them off-device).
Whilst I have Signal's own daily backups enabled, I also want to keep fresh copies of the encrypted exports from this fork. Currently I'm just doing this ad-hoc when I remember to run an export. It would be useful to have an option to schedule these, in a similar way to the built-in chat backups.
From requesting similar automatic backup options in other projects, I believe this should just be the case of adding a JobService or Worker that wraps the existing export logic, and the UI to schedule/cancel it.