Error: Error while saving e-mail
Ignoring this error message.
If you want, please report the following traceback at www.gmail-backup.com/forum
Thanks! (gmb.py revision 691):
Traceback (most recent call last):
File "gmb.pyo", line 1225, in backup
File "gmb.pyo", line 956, in store
IOError: [Errno 2] No such file or directory: u'D:\\Backup\\Mail\\myemail@address.com\\2009_03_20090329-071913-address@email_domain_com-161b-long-email-title.eml'

This is because of character limit of filenames (to 256 chars) in Windows env. In my example (I cut it out), my path has 38 chars long and filename has 231 chars. It's too long for Windows.