Is there a way I can compare ALL my local files against an account? Or do I really have to go through one-by-one ?

Pull then down into another directory & use a tool of your choice to compare the two? (i'd just use

diff

in a shell loop)

Make sure your local git branch is all committed, re-download from NS, and let git show you the diffs.

Mike's suggestion is exactly what I do. Works great.