Just tested AndOTP with seedVault in LineageOS 17.1. works like a charm.
Enable the backups in AndOTP, run a regulär backup. Next time you uninstall the all by accident, you can just reinstall it and it continous to work. I still recommend to do a manual, encrypted backup from time. to time.
@Dashtop seedvault is a systemapplication that implements the Android Backup capabilities and allowed encrypted backups using backends like nextcloud or an external drive.
See: https://calyxinstitute.org/projects/seedvault-encrypted-backup-for-android
Nowadays it's integrated into LineageOS as well as CalyxOS and can be found in the settings app.
@sheogorath that's great. Sadly I just looked into it and it seems not to be installed on regular is :(
@sheogorath is seedvault a non root app?