Re: I've over-archived. What to do?

[Graham Percival <gperciva@tarsnap.com>]

On Fri, Aug 03, 2018 at 06:56:29AM -0500, Ed Ahlsen-Girard wrote:
> If I narrow the sieve and run a backup with it, then delete the space
> pig, will the sieved down backup retain those bytes from the deleted
> archive that are still in scope,

Yes!  As long as you create the new backup first, tarsnap will automatically
detect which chunks of bytes are in use by both archives and will not re-upload
those chunks.  Then when you delete the pig, tarsnap will automatically delete
chunks of bytes that are not used in the newer archive.

If you're interested in the math behind it, please see
https://www.tarsnap.com/download/EuroBSDCon13.pdf

Cheers,
- Graham