Bob,
it's not as easy as it sounds... For example you might of purchased styles at one point some years ago, but not the underlaying RT's. Just that will screw things up. File versions from various years too might have impact. That is why it's better to do a clean install of content, apply last BIAB 2014 patch and live happily ever after than try to create a Frankenstein.

P.S. Also, by downloading proper packages with Download Manager will give you a "consolidated" local backup. PGM should be able to tell you what exactly you need to download from your account to make it whole.