Official comment
We previously had a beta with a Dropbox database option, but it was removed because it's a bit of a technical nightmare syncing the database and music.
I have a guide on how to put your database in Dropbox, which takes some modification of files to get set up, but works great. This method is unofficial and is unsupported, but I've not had issues with it.
As for "automatic," rekordbox already keeps 3 backups of the database - you should also be making your own backups outside of this scope.
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