I'm trying to set up an offsite, offline backup procedure for my company's critical information. We already have an in-office redundancy backup set up using RSYNC that backs everything up onto two separate hard drives once a day, and we would like to take our existing backup system and duplicate it onto a third drive that we can then remove and carry offsite every month or so.
My question deals with the duplication step. We're looking for something simple but automatic (or easily able to be automated). My initial thought was to recast one of our current backup drives as a RAID1 pair, get a hot-swap drive bay (that is, something like this Antec Easy SATA http://store.antec.com/Product/accessories-other/easy-sata/0-761345-30750-5.aspx), buy a few extra drives, and swap them in as needed, letting RAID rebuild the drives automatically as we go.
The problem is, I have no experience working with RAID, so I don't know what to expect. I'm trying not to re-invent the wheel. In my mind, using RAID is ideal because
- The addition of a new backup drive would be transparent to our current setup, and not require any changes outside actually setting up RAID
- The added procedure for backing up the data would be reduced to
- Grab the current drive
- Hot-swap in a blank replacement drive (or a previous backup to be overwritten)
- The system will automatically treat the replacement drive as a failure and rebuild it; when it is done rebuilding, the drive will always be kept current and ready to be removed
Does RAID actually work the way I'm thinking? Or is there an easy way to make it behave this way? If not, is there another setup that will be this simple to maintain, just grab and go?