I second the Terastation approach. I've got a couple of non-RAIDed drives hanging off the back of the Terastation, and back the Terastation up to them weekly. So I can survive a drive failure, and a system failure. Since drives are so cheap now, I've got a spare sitting there ready.
In my one and only ever power failure, the Terastation took 45 hours to sort itself out after restarting. So now I run the Terasation, backup drives and the switch off a little UPS: the Terastation only consumes something like 57W at full power, plus 50W for everything else. The Terastation does a graceful shutdown when the power goes out.
I was a long-time user of tapes until the first time I really did have a disaster, and needed to recover a system... after that, I went to hard disks :-)
In some markets, the Synology RAID unit is sold without drives. It's a nice, small, quiet unit, with or without.