I’m often wiping phones for testing purposes. One of the first apps I install afterwards is davdroid (DAVx5 ). Having multiple accounts I would like to have the possibility to export / import not only the accounts but also all the individual calendars, address books and task lists (> 10!). If possible even saved if they are marked for synchronisation (I keep some address books only for backup).
For security reasons without passwords or only when hashed properly.
Just a thought.