Originally Posted by s2cuts
From personal experience I know I won't need to cycle the drives more than once a week to do the backups. Does anyone see anything wrong with that? Once a week doesn't sound like too much does it?
I really wouldn't worry about spinning a disk up once a week for backups and leaving it spun down the rest of the week. That seems like a very easy life for a hard drive. My box is shutdown every night and I suspect many others are too, so once a week is nothing.
The disk cycling issue is a problem you can get with some drives that go to sleep far too quickly and get themselves into a sleep, wake, sleep, wake, sleep, wake... situation during normal system use.
By the way, going back to your original post, using raid-1 as a backup is not a good idea as it's not a true backup solution (it protects against hardware failure, but not data corruption or accidental deletion), so you're better off having a dedicated backup drive for other reasons than just disk wear.