If you're trying to syncronize multiple folders checkout synkron it will treat each of your folders as "master" or "slave" and can run from a thumbdrive.
Use it with some perspicacity. The 'master' -> 'slave' relationships work well. But, if you've not thought through implications -- you can create issues for yourself. I try to make my network drive the 'master', the local drive, a 'slave', and I may/or may not make a 'slave' backup to a thumbdrive.
Pay attention to extensions in/not in your blacklist. I _exclude_ most sensitive data while at clients, .xls, .accdb, etc. But, include libreOffice files (my own working documents). Note: add lower case _and_ upper case in your lists(see my samples).