Automatic backup in Outlook, possible?

You have many, many options - some native to Windows, some which can be implemented using the SMB protocol and Linux.

Most of all - you need a scheduler of some kind (cron, at, etc). There's a package I've used called WinCRON that will periodically execute a command. At that point all you need to do is whip up a .bat or .cmd (with the Scripting Host) file that actually executes a backup.

Another option for you is to use SMB and linux - share the disk where the postbox is sitting and write yourself a perl/sh/bash script that does it

Yet another option is to use PowerArchiver and it's scheduling options. Haven't used them, but noticed them as I was downloading it earlier today.

Good luck.

graham@imperators.ca