Well, WyomingKnott, you've shined a spotlight on my ignorance! First of all, I realized I mistyped. The drive is a FreeAgent GoFlex 320 GB drive. It backs up my harddrive on an oingoing basis using Memeo Instant Backup. I use it only as my backup. Because it is an older drive, it does not permit picking and choosing what to back up. It just automatically backs up everything on the C drive (I see files I don't even understand such as eula, ini, installs, dll, and tons of others), especially when I make any kind of change. For example, if I move something from my desktop to a file, I can see in the lower right window that it backed up that change.
I really don't need the nuts and bolts of my computer if something goes awry (I probably need a new PC anyway). But I need to know I have my documents backed up and safe. To be honest, if I lose all that other info by reformatting the drive, it wouldn't be so bad.
Sorry to be so dumb when it comes to this stuff. If it's too frustrating to answer, I'll understand 🙂.