One of the 1 TB Seagate drives in my main home computer is throwing an error that the RAID mirror sees on start up of the machine. This most likely means that it's time to buy a new drive to replace the failing one. I'm not sure when I'm going to be able to do this, but it certainly needs to be soon.
In the meantime, I'm backing up the documents directory to the NAS.
Because a RAID mirror is good. And when a drive is starting to fail, a recent backup is even better.
(Ok, a recent backup is always better, but...)