Hot swap HDD's, are NOT made for constant swapping. It's a cool feature, but not one made for longevity of constant swapping. Please get over this notion first. It will save you down the road.
If you are looking for disk based storage, perhaps look at BackupExec System Recovery instead. It can handle physical drive removal much better.
Then look at using a USB or NAS type storage as your backup target. These can be plugged in and out much more reliably than hotswap drives. ANd System Recovery wont default to "off-line," like BE does.