Re: Incremental backup for a raid1

[Michael Schuerig <michael.lists@schuerig.de>]

On Friday 14 March 2014 06:42:27 Duncan wrote:
> N-way-mirroring is actually my most hotly anticipated feature for a 
> different reason[2], but for you it would work like this:
> 
> 1) Setup the 3-way (or 4-way if preferred) mirroring and balance to 
> ensured copies of all data on all devices.
> 
> 2) Optionally scrub to ensure the integrity of all copies.
> 
> 3) Disconnect the backup device(s).  (Don't btrfs device delete, this 
> would remove the copy.  Just disconnect.)
> 
> 4) Store the backups.
> 
> 5) Periodically get them out and reconnect.
> 
> 6) Rebalance to update.  (Since the devices remain members of the
> mirror,  simply outdated, the balance should only update, not rewrite
> the entire thing.)
> 
> 7) Optionally scrub to verify.
> 
> 8) Repeat steps 3-7 as necessary.

Judging from your description, N-way mirroring is (going to be) exactly 
what I was hoping for.

Michael

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Michael Schuerig
mailto:michael@schuerig.de
http://www.schuerig.de/michael/