Allow (encrypted) app backups e.g. via SeedVault

[Diapolo]

I'd like to propose a change in the app to allow CWA to be backedup via encrypted backups.

Avoid duplicates

• This enhancement request has not already been raised before
• Enhancement request is specific for Android only, for general issues / questions that apply to iOS and Android please raise them in CWA-Wishlist

Current Implementation

Current CWA app doesn't allow encrypted backups via SeedVault (backup App for Android, integrated in LineageOS or CalyxOS, see https://calyxinstitute.org/projects/seedvault-encrypted-backup-for-android).

Suggested Enhancement

Allow encrypted app backups :).
See https://github.com/seedvault-app/seedvault/wiki/FAQ#why-do-some-apps-not-allow-to-get-backed-up for a description of the problem and see this sample how Transport (Android app for public travel) implemented it: grote/Transportr@4dc38f4

Expected Benefits

Allows a secure and easy app backup and restore including certificates.

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Internal Tracking ID: EXPOSUREAPP-10053

[Ein-Tim]

Related issues:

• Backup exposure history to transfer to new/reseted phone cwa-wishlist#8
• Allow backup of contact-journal & event-registration store cwa-wishlist#500

[sapcoder123]

@Diapolo Thank you for reporting the issue!

Related issue is corona-warn-app/cwa-wishlist#852

[mtwalli]

Not planned