Cheers for all your thoughts.
I've backed everything up to an external hard drive anyway, and was more fussed about clearing some space. The loft is an option, but I'm just not big on hanging on to loads of possessions gathering dust if they could be doing someone else a lot of good. I'll hang on to some special CD's as double back up, to be sure to be sure, but I think I'll clear the rest. If they're worth sweet FA then Oxfam are going to do well out of me.
C