Install "duplicity" package by default and let user configure backup in onboarding app

### Problem

I know too many people who don't make any backups and only then start to worry when it's too late and their data is already lost.
Humanity as a whole could benefit from that because the time needed to get new copies of documents, etc. could be invested in cleaning the environment, working on cures for diseases, etc.

### Proposal

Install duplicity by default. Guide the user to configure it.
An encrypted cloud backup to any of the major providers (Onedrive, google, dropbox, nextcloud) etc. should be available by default

### Prior Art (Optional)

_No response_