Transportr VS Seedvault

Unfortunately yes. I see most of the providers were removed from Navitia's side: https://github.com/grote/Transportr/issues/877

Citymapper → Transportr (seems abandoned...)

Better, the city could pay to improve existing FLOSS applications (Transportr for instance).

Transportr - Open Source Public Transit (version 2.1.4): Free Public Transport Assistant without Ads or Tracking

Transportr (version 2.1.3): Public Transport Companion

In my opinion it would be good idea to let users backup Tutanota application using Seedvault. Here you can see example of how such backup option could be implemented in privacy-respecting way. More details about it here. Thank you in advance.

Source: https://github.com/grote/Transportr

If you can read Java you may haves a look at the Transportr source code. I don't know if it covers Oran but at least it should give you an idea how to do such an app.

if you use an AOSP based ROM, give Seedvault another look since they merged device2device-transfer in the beginning of the year https://github.com/seedvault-app/seedvault/pull/562

You can get support specific to Seedvault on Matrix, or via the Discussions or Issues pages.

There's no way to do a direct image. You can try using seedvault to back up individual pieces of data though: https://github.com/seedvault-app/seedvault

https://github.com/seedvault-app/seedvault/wiki/FAQ and you could look in the Issues, etc.

For the innterested ones after me https://github.com/seedvault-app/seedvault

You may want to thumbs up https://github.com/seedvault-app/seedvault/issues/416

SeedVault

There is Seedvault which allows to backup to a USB drive or cloud with end to end encryption.