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Re: Does anyone want key-resistant tamper-evident archives?

On 09/08/16 03:27, Arthur Chance wrote:
> A question for Colin: would it be possible for tarsnap to have a faster
> restore mode where it simply created an unencrypted tar file on the
> client equivalent to a given tarsnap archive, to be restored from as
> necessary, or does the architecture preclude it? That would at least
> speed up full restores after a crash that lost everything.

There are several things which need to be addressed in order to get
better extract performance.  Speeding up --list-archives is the simplest
(although still far from simple); next is 'tarsnap -r' (which is what you're
describing); next is a partial fix for 'tarsnap -x' which speeds up large
file extraction but has little effect on small files; and the hardest is
a full fix for 'tarsnap -x'.  The difference between these is basically just
how hard it is to figure out which blocks we need.

So yes, the plan is to do what you describe.

Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid