On Wed, 22 Nov 2023, Matthias Nagel wrote:
Dear all,
I am using Dovecot sdbox format for mailboxes. Is there an option to
temporarily make Dovecot read-only while the mailboxes are being backed-up
such that a consistent state is backed-up?
I am looking for some command which I can use as pre- and post-hook for
Borgbackup. I am looking for a way such that Dovecot defers any mail coming in
via LMTP from Postfix, denies modifying mails/mailboxes via IMAP while Dovecot
still allows to browse mails read-only.
Is that possible?
I think the recommended way (and this is what I do) is to use "doveadm backup"
to do a one-way synchronization (i.e. a backup) of the "live" mailboxes to
another destination (which can be local or remote).
In my case, I periodically run doveadm backup to make a local "snapshot" of the
mailboxes, which I then backup, using both rsync (to one server) and borgbackup
(to another server).
AFAIK (but I don't have a reference now), using "doveadm backup" will create a
working/consistent snapshot, even if dovecot writes/changes/etc. messages. This
is not the case with rsync or any filesystem-related utilities.
Hope that helps,
Bernardo
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