USB Sync with Rekordbox 6

Hiya, I’ve recently been getting gigs which are requiring me to use USBs rather than my normal laptop set up. Lexicon is working perfectly for me adding new tracks into my relevant engine and rekordbox libraries but i’m having an issue with my rekordbox usb sync.

I created 2 new fresh identical usb’s for these with 3 or 4 genres consisting of around 5000 tracks on. However, every-time I add new music to lexicon and sync to rekordbox, when I then try to update the USB’s rekordbox is removing the entire library on the USB and re-syncing everything again. This is quite frustrating as to add 15-20 new tracks I need to sync all 5000+ songs again which takes a good few hours.

Does anyone know of a way to address this or is this just a downside of creating new XML files each time I add new music? any help/ advise would be much appreciated.

Thanks

Charlie