Hi Holly,
Loading CDs to the B2 is a two stage process - first the B2 makes a high speed copy (rips) of the CD and stores it in it's original digital format (WAV). Later when idle (and in standby mode) the B2 compresses any WAV files to FLAC (by default) or MP3 to save disk space. Compression is quite slow so we recommend ripping 20-30 CDs at a time and leaving the B2 powered over night to compress the files and be ready for use the next day.
As the guys have said, it is best to let the B2 compress all files (Tracks) before doing a backup, otherwise you'll end up with WAV and FLAC (or MP3) versions of the same Tracks on the backup.
You can check how many Tracks are left to compress by pressing INFO on the remote. This will give a readout on the B2 showing the number of Tracks, Albums and Artists, the number of WAV, FLAC, MP3 or AAC Tracks and disk space used.
WAV Tracks are the uncompressed ones (3201 in your case, it appears). This will take a few nights to compress... Let us know what the display shows.
Paul
Brennan Support.