I've had some success with restic to create incremental backups of mail 
directories on external storage. Very space efficient, and restic will handle 
all the de-duplication, pruning etc.

You could write a filter to exclude the dovecot index files, or just restore to 
a different directory before copying the mails you want back to their 
destination.

P.

On 12/02/2022 00.55, Stephane Magnier wrote:
Why not doing an rsync of the folders ? Will it damage the index file ?

On 2/11/22 12:33, Jorge Bastos wrote:

Howdy,

I have a particular situation where I have about 5 users using a large account 
in IMAP, and I have the need to backup the account daily or weekly or so.
I was thinking about to copy the whole directory, each email is a file, it 
could probably work, but the dovecot index files would be damaged/wrong.

Is there a tool that could perform a backup (ex: yesterday), and when I 
inserted that backup, it just insert the emails and folders that were deleted 
today?

Thanks in advanced,
Jorge



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