Backup/Restore should be implemented according to this documentation: http://developer.android.com/guide/topics/data/backup.html

1. Databases, preferences (in files) and Accounts should be backed up.
2. Maybe Avatars should be (optionally) backed up also?! They may be really needed for older messages, for which these avatars may be not available online now.
3. In addition, I guess we should encrypt passwords/tokens, using e.g. password, provided by a user during backup/restore (if this is possible...)

Current state of implementation as of 2020-04-27:

• The feature is located in AndStatus Settings -> Storage -> Backup.
• Points 1 and 2 above implemented. I.e. attachments and avatars can be optionally backed up and restored (just set "Backup media files" checkbox)
• Log files can be backed up and restored also. Just set "Troubleshooting -> Backup log files" checkbox.