I asked on /g/ but they were assholes..

So JPG is a lossy format, that's okay I don't intend to resave the photos.

But will there be quality loss from compressing a whole bunch of JPGs in a ZIP or RAR file? Or does it pretty much work like magic and it's perfect?

Yeah, yeah, maybe it's just some pixels lost here and there but I'm anal and I want to backup my photos to DVD and stuff.