Any idea why Hotsync would not backup a database with the "backup bit" set?

Explanation: for some reason after a hard reset, my CalendarDB-PDat.pdb file went AWOL from my backup folder on my PC. I used Filez to examine the attributes, and noticed that the backup bit was not set. I subsequently set the backup bit, but Hotsync still doesn't backup the file.

Thanks in advance for any suggestions.