CFI 4-Bay eSATA Port Multiplier RAID Enclosure
 

I think everyone who has anything more important than the latest round of email jokes on your system should have some sort of Raid setup, or at the very least external backups. And I see no reason not to check out the CFI B4043 to see if it fits your needs

http://virtual-hideout.net/reviews/C...ox/index.shtml

Got me a file server which does backup over 2 disks (none raid, just file-copy with differences (incremental) backup) and I write to external USB2.0 drive every month and to DVD every 2-3 months.

no need for RAID at home:)