Re: [rdiff-backup-users] incremental or differential backup

[Ryan How]

I've also wondered the same thing with restore times. Maybe we should 
give it a test?. I know backing up my virtual machine images (around 
30GB single file) takes a LONG time to make the diff. a couple of hours. 
But it isn't running on a super machine. That essentially is the same as 
a database - big file with many small changes. But I would assume that 
applying a diff would be much much quicker than generating one because 
we aren't comparing a whole file, we are just adding bits and removing 
bits in certain sections.

When restoring, does rdiff-backup apply all the diffs at once? does it 
apply them in-place? or does it generate a new file for every version 
and then apply the next diff until it gets to the desired version?.

Ryan

Dominic wrote:
> Michael Biebl wrote:
> > > > 2.) If one of the rdiffs goes corrupt (e.g. via a bad sector), all my
> > > > older backups are broken.
> > > mmm, true I think, you should use raid or (better IMHO) a secondary 
> > > backup
> > > (use rsync).
> > >     
> > Is there a reason why you recommend rsync for that? If I understood
> > the project description correctly, rdiff-backup should work just fine
> > for remote backups.
> The reason I use rsync for the secondary backup is that I just want a 
> mirror of the data on the first (rdiff-backup) backup machine - 
> including (and especially) all the rdiff-backup archives. Doing an 
> rdiff-backup of an rdiff-backup archive would seem too much of a good 
> thing. Or maybe I just can't get my head around it.
>
> Dominic
>
>
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