Thanks for the input everyone
@gilles - the archiver plugin you linked to isn't exactly what i was thinking of, but I could see how it could work for me. Best solution so far i think - I'd like to add comments to versions too, but I guess i could modify the script to do that fairly easily
@Jeff - I have a Mac, but I haven't seen versions before. Integration with that would be great
@rRich - Currently, I just save everything directly to my dropbox folder. Is that what the plugin you linked to does too?