If the iTunes Match is uploaded then all the internal MP3 information is intact. Not sure about matched, might be that the SW does not know of al the Traktor specific ID3 tags. If this is the case, it’s worth filing a bug report to Apple about this case for full sync of all ID3 tag info.
I do have all my production work including all tracks (iTunes libraries) backed up by BackBlaze. For $5/month unlimited backup it’s a no-brainer for any producer to get that in place. The background backups are also pretty snappy with BackBlaze. Worst case I could download tracks from the BackBlaze cloud if needed.
Anyway, as a third option I have music on a 16Gb USB drive in my wallet so that’s another option, too… You could get plenty of MP3/320k files on a 16Gb drive, enough for playing for a whole weekend.