Rekordbox 6 backing up dropbox folder

Went from RB 5 to 6 , workflow is better now I need to know the following. My original RB5 database is on an external hard drive the RB6 files are now in a Dropbox folder. I want to be able to back that up locally using Time Machine I was thinking , if I backup the dropbox folder the RB6 metadata is not in there am I right? So what files do I back up usingg Time Machine?

Thx R