Convert Maildir to Dbox?

[Tanstaafl]

On Wed May 29 2019 02:00:24 GMT-0400 (Eastern Standard Time), Aki Tuomi
via dovecot <dovecot at dovecot.org> wrote:
> On 29.5.2019 8.17, @lbutlr via dovecot wrote:
>> Are you sure you read
>> it? https://wiki2.dovecot.org/MailboxFormat/dbox seems pretty clear.

> David, in particular, is there some question you feel that the wiki
> fails to answer?

I'm not David, but I just read the entire page and one thing that I was
specifically interested in has to do with the importance of the index files.

I seem to recall reading somewhere that dovecot saves more than one
version of the index files to reduce the chance of losing the indexes,
but I don't see anything about that.

Also - is it possible to configure dovecot to keep multiple copies?

I was also planning on putting the indexes on either a ZFS or BTRFS
partition to further reduce the chance of data loss (self-healing
preventing silent data corruption, and snapshots), but only saw a
comment that they can be stored in a different location, but nothing
about why you might want to do that - e.g., to use a more resilient
filesystem to store these critical files.

Another aspect I'd like to see is recommendations for backup strategies,
with respect to the fact that the indexes are so critical.