Sorry, this is a bit geeky. Just before calling it a day at the office, I thought I'd perform a quick optimization (compression)
of a "Parallels" Windows installation on my Mac. Yeah, right. Two hours later, I gave up in frustration, and restored from a backup.
The casualties? A missed choir rehearsal, and a concert on Sunday I won't be able to sing, since we've now missed too many rehearsals.

Well, it's probably all for the best. We were trying to do too many things anyhow. Probably would have gotten ourselves sick...