Yeah but I'm thinking offsite backup. The point of the RAID in my desktop is to minimize my frustration and downtime if a drive fails, but not necessarily data loss, since that's taken care of by backups. The external RAID backup will be a data backup but in case of theft or fire, bye bye data, so I'm thinking offsite which means either tape or hot swappable drives where one can be removed from an array and stored offsite and the drive that was offsite can then by cycled back into the array so that there is always a "safe" and encrypted copy of all of my data offsite.