Thanks, rharv, MarioD, and Bass Thumper, I truly appreciate your thoughtful answers. My husband saves his songs/arrangements on the same external hard drive as the BiaB program (NOT on his laptop). So I must connect the hard drive to my PC in order to back it up. The main question I had was whether I could safely plug in the BiaB external hard drive to my PC without it thinking it needed to auto-install anything on my PC.

Gordon Scott, thank you! The fact it doesn't automatically install anything is exactly what I needed to know. My husband plays jazz, too, and is (IMHO) very good.

Just as an aside, I do trust BackBlaze. I've been using it for years for my photography business (the reason for the two other external hard drives I have attached to my PC) and have never had a problem with it.

Again, thanks so much, everyone, I tried google searches but until I found this forum, I could not find an answer to my question. You guys are great!