Comment by Robotbeat

This is very much a backup option of last resort. I maintain a real backup solution inside my house, but basically nowhere to keep something off-site. I do not consider the cloud acceptable. For my top tier priority data (low total file size), I really want something stored elsewhere.

Given the non-ideal state of the car, I think the plan would be to just replace that drive on an annual basis.

It's still very valuable to have a reasonably robust backup even if you skimp on maintenance, though. No one's going to smash your hard disk with a hammer to punish you for being lazy. 90% isn't much different than 99% in an exceptional circumstance.