I've just gone through the process of moving my iTunes and rekordbox libraries to a dropbox folder so that everything I add to my collection is ultimately backed up to my dropbox account. I use iTunes sync so the two collections are intertwined.
I'd also like to back up the actual rekordbox taxonomy as well and have done this with the File>Library>Backup Library option. The resulting zip file is now sitting in dropbox as well. I chose NOT to backup the music files during this process however as I assumed it was redundant since my library already exists in Dropbox and is being backed up through iTunes.
I'm just wondering, is this the right move? If I have a situation where my computer implodes will it be easy to set up Rekordbox and all of my playlists/cues/etc. on a new computer? Or is it advised that I do the Rekordbox backup and copy the music files as well?
And if anyone is interested I decided to do this per the advice of Avalon Emerson in this Resident Advisor podcast. Really interesting listening about how different DJs organize their tunes: https://www.residentadvisor.net/podcast-episode.aspx?exchange=382