I have already had a major setback for the RetroChallenge. While getting things organized, my hard drive started clicking and slowing down. Unfortunately, I backed up the wrong drive. By the time I figured out which drive was making the noise, it was too late to backup.
I ended up putting it in the freezer for a while and had a few error free minutes to get the most important stuff off. After tightening up the screws on the top and sending it in and out of the freezer, it seems to have shaped up considerably though, but it is running very slowly. I am now backing up the entire disk which, by the progress indicator, will take several days. So, at least there is some hope.