Re: [rdiff-backup-users] delete initial mirror

[R. David Murray]

On Fri, 23 Oct 2009 at 06:40, Alex Samad wrote:
> On Thu, Oct 22, 2009 at 08:41:57AM -0400, Daniel Miller wrote:
> > On Oct 21, 2009, at 10:03 PM, plug bert wrote:
> > >   Hmm...so in that case, if i want to incrementally back up a
> > > 100gb file daily for one week, and for simplicity's sake, assume
> > > the file grows 1gb per day, my backup media will need to be at
> > > least 100gb + 6gb?
> >
> > Yes... plus a bit of space for rdiff-backup housekeeping data.
>
> sorry, doesn't rdiff-backup work at the file level, not the block level.
> so a 100G file that has 1 byte changed, mean that 200G of backup space
> is used ?  so for 6 days of changes to the 100G file that would take up
> 600G of space

No, it uses librsync and does deltas on "arbitrary length octet streams".
So it only transmits and stores the changed data, not a new copy of the
entire file.

--David