By the way, as mentioned by Bill Moran. Maildir does not inherently keep its own indexes, it only applies unique names to its mails so indexing can not be an issue during backup. The only issue can occur if and only if a message is received during the moving of a new message and at the same time an ls (readdir()) is done on the directory the backup could "skip" a new email. So in the worst case you could lose a few unread new mails.
More about the maildir format here: http://cr.yp.to/proto/maildir.html & it's locking issues on http://en.wikipedia.org/wiki/Maildir
Is it possible to mount a zip file in loopback? Like one can do with an
.iso file? Instead of an encrypted file system, does a compressed file
system exist? Then he could simply rsync the folders with this file
system mounted in loopback, unmount it and backup the files that sat
underneath it. It might make sense to do that user per user to make the
restore operation a little bit more practical.
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