advice sought on tape backups with cyrus-imap

[Ed Budd]

Hi, all:

Hoping for a "reality check" from anyone on the list with experience
in doing tape backups with cyrus-imap:

I've got FBSD 5.2.1REL acting as a mail server running cyrus-imap and
wondering what the best (read: safest) method of backing up user
mailboxes to tape might be. Can I just dump/restore everything
under /var/imap or is there more to it than this, considering the
mailboxes are stored in cyrus db format? Does this matter when it comes
time to restore?

Thanks in advance for any feedback offered, especially warning on
any gotchas born from experience :)

EB