I’ve posted another backup solution to the MikroTik wiki here: http://wiki.mikrotik.com/wiki/Centralized_Automated_Backups_via_Email_with_Procmail_and_Perl
It’s really just an expansion of email backups with a way to save only the attached backup file from the email to a directory/share on the mail server. This assumes you’re running your own *nix mail server. 
If you have several MT devices, this will keep your inbox from filling up with backup files.
Rob