Roon/Qobuz lost 7000 files

I have an Innuous Zenith 3 using Roon/Qobuz/Tidal (haven’t upgraded yet to the new Innuous os). A couple of days ago, the number of saved albums on Roon suddenly dropped from 13000+ to 6000+.  As far as I can tell the missing albums are from Qobuz.  It took me hours and hours to find and save all these albums.  I backed up my Zenith on an external hard drive but Roon isn’t backed up because it doesn’t recognize my external hard drive—only recognizes Dropbox which I haven’t used because it’s expensive to subscribe.  I’ve contacted Roon and Qobuz but so far they haven’t offered a solution.  I’ve read on various message boards that others have experienced the same problem.  If anyone has any advice, I’d greatly appreciate it.