Maybe I shouldn't worry about this, but, it did seem kind of weird. I searched for "bootable copy" in Disk Utility's Help Viewer. I got two results. I clicked the first, and I got an error message, saying it could not read the URL, even though the thing it said it was trying to get was clearly a location within my disk. Strange thing is, if I clicked it after that, it would take me to Help Viewer's "home". I relaunched, and when searching for it again, I only got the other result. Weird stuff is going on, and I thought it would be good to ask what was going on.