That's here, in case you missed it.
Well, here's a cautionary tale.
I co-produced and MD'ed a fantasy musical, which started life as a set of songs a couple of decades ago and plain grew, at a SF con a few years ago. We got FOUR people to video it from different angles, and I took all four sets of video files, and, just to prove I'm not a complete moron, backed them up on TWO different hard drives, one a HP Media Vault, one a WD 1TB external USB drive, because when we have more time, we're going to make a DVD.
Both of these have been stored in reasonable conditions in two different rooms in the house.
The HP Media Vault packed up a couple of months ago. I finally got around to checking it this week, because I need those video files. The drive has the click of death, and isn't coming back.
No worries. I can get the files off the WD external.
It won't spin up.
You can never have enough backups of critical data.