When was that failing? What I noticed is that I had the maximum number set at 5, but the backup directory contained only:
2 backups for the Aura
2 backups for the Touch (probably from a time when the Aura files were named Touch, because I never had any Touch)
1 subdirectory
And it seemed that the Aura backups were being correctly rolled, but only the latest 2 remained (except that it doesn't save more than 1 per day). So thought maybe all the files and directories were counted. Anyway, I have tested again today, after I removed the old Touch backups, and still I get only 2 backups. If the new update fixes this (I'll try later), then ignore it, otherwise consider this as a new bug report