Switch to obnam for backups

src/freedombone

 # name of a script which keeps running processes going even if they crash
 WATCHDOG_SCRIPT_NAME="keepon"
 
-# the type of backup system used
-BACKUP_TYPE='rsync'
+# the type of backup system used, rsync or obnam
+BACKUP_TYPE='obnam'
 
 # Name of a script used to create a backup of the system on usb drive
 BACKUP_SCRIPT_NAME="backup"