Backup and restore management (fix #13)
Ref #13 (closed)
The idea is that we have a "backuped" folder, where we store everything that we want to backup, for example the database or the user medias, but this will also the place to store some other apps data (example: KA-lite SQLite database). Backups are just a zip of this folder, and restoring means replacing the current folder by the unzipped files of a backup.