Re: extract fatal error

that makes sense, and it works now.

instead of doing decremental, i just modified the script to to make an
additional full backup of the most recent backup (not incremental) and
deleting the old additional full backup with each run

this does take up a lot of space, however for my purposes it works,
plus the amount of space i save with delta sig for the rest of the
incrementals more than makes up for it

thanks!

On Tue, 24 Aug 2021 at 08:13, Denis Corbin <[email protected]> wrote:
>
> Hi,
>
> On 23/08/2021 17:50, griffin tucker wrote:
> > i'm trying to make incremental backups with delta sig in a script
> >
> > first full backup runs fine:
> >
> > dar --create "../${1}-${dd}-full" --delta sig --compression=gzip:5
> > --hash=sha512 --slice=2G
> >
> > then the incremental backup seems to run fine:
> >
> > dar --create "${1}-${dd}-incr" --ref="${dar_prev_name}" --delta sig
> > --hash=sha512 --slice=2G --compression=gzip:5 --quiet --fs-root
> > "./${dd}/"
> >
> > with no errors reported
> >
> > however, after testing the extraction of the archive:
> >
> > dar --extract "${1}-${dd}-incr" --ref="${dar_prev_name}" --fs-root
> > "${dd}/temp-${1}-${dd}-incr/"
> >
> > i get:
> >
> > FATAL error, aborting operation: The archive and the isolated
> > catalogue do not correspond to the same data, they are thus
> > incompatible between them
> >
> > what am i doing wrong?
> >
> >
>
> The reason is that you do not need to provide the --ref option when
> extracting a backup, unless the argument given to --ref is an isolated
> catalogue creeated from the backup provided to the --extract argument
> *and* you want to use this isolated catalogue as rescue of internal
> catalogue of the archive you want to extract data from (if for example
> the backup is corrupted near its end, where is located the internal
> catalogue).
>
> In brief: just remove --ref="${dar_prev_name}"
>
> Note that restoring an incremental backup is expected to be done right
> after the backup of reference it has been using, thus in your case, you
> should do something more or less like this:
>
> mkdir "${somewhere}"
> dar --extract "../${1}-${dd}-full" --fs-root "${somewhere}"
> dar --extract ""${1}-${dd}-incr" --fs-root "${somewhere}" -w
>
> add -w (or -r) if you are OK to overwrite files by a more recent
> versions saved in the incremental backup (else dar asks permission to do
> so for each file...).
>
> Cheers,
> Denis
>