Best way to backup cyrus system

[Lawrence Greenfield]

It would be nice to add a backup section to the documentation.

Live backup is supported with Cyrus, though running "dump" on a live 
filesystem is only to be done with care. We use vxfs on Solaris and 
snapshots and have been happy with it.

The databases are backed up by Cyrus 2.1 every checkpoint period into the 
db.old directories. At least one of those directories should contain a 
clean copy of the berkeley db databases.

In general, mailboxes can be restored if the message files are around---you 
can always delete the cyrus.* files (losing flag state) and run reconstruct.

Larry