I've got a little home file server - used for items shared in the household as well as for Time Machine backups of everyone's computers (me, wife, 3 kids). The server is a 2006 Mac Pro with a few hard drives in it formatted as a RAID 0 stripe (needed the added capacity; not so much for speed). Now I'm looking for a backup strategy. It doesn't need to be archival like time machine is - simply a mirror of all the data a couple times per week would suffice. Total volume of about 3.5 to 4.0 terabytes of data (Time Machine data of 6 computers plus a mirror of the main iPhoto and iTunes libraries and a few miscellaneous items). Suggestions for a backup strategy? Carbon Copy Cloner to a large external drive? Any way to add an existing volume to a RAID 1 mirror without destroying the data that already exists? Thoughts appreciated.