Laurent, If you are using ssh backups in rsnapshot, you should check that the ssh will work without asking for a password. If this is the problem, you would probably see ssh ask for a password if you run "rsnapshot hourly" by hand as root (unless it relies on a key from ssh-agent or similar).
If that doesn't help, trying sending the output of # rsnapshot hourly and your backup lines from /etc/rsnapshot.conf. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]