Sorry that it isn't very clearly stated - yes, v4 does store inode-like
information in the backup tree (and can therefore accurately represent
hardlinks etc), but it uses regular files to do it - it doesn't use real
hardlinks, and it doesn't depend on the real client's inode (and inode
numbers) on the file system being backed up.  Therefore it's portable
across different underlying file systems on the server.

Craig

On Mon, Aug 7, 2017 at 9:00 AM, Bzzzz <lazyvi...@gmx.com> wrote:

> On Mon, 7 Aug 2017 08:50:30 -0600
> Ray Frush <fr...@rams.colostate.edu> wrote:
>
> > Jean-Yves-
>
> Ray
>
> > I believe you may have been looking at v3 documentation.   BackupPC V4
> >  does _not_ make extensive use of hard links.
> >
> > See: https://backuppc.github.io/backuppc/BackupPC.html#BackupPC-4.0
>
> Na, I'm on: http://backuppc.sourceforge.net/BackupPC-4.1.1.html
>
> searching "inodes" leads to this paragraph:
>
> "Inodes for hardlinked files are stored in each backup tree. This makes
> backing up hardlinks accurate, compared to V3, and provides for
> consistent inode numbering across backups."
>
> As there's a comparison w/ v3, it is of course targeting v4.
> This is why I ask, 'cos it collides with what you said.
>
> Sooo, I don't know what to think 'cos moving a regular hardlink isn't a
> problem as the FS is taking care of inode(s) swapping, but IF v4 is doing
> it's own not-hardlinking-but-much-like-it, moving a file whose inode's
> reference  is contained in another one would break this system (?)
>
> JY
>
> > --
> > Ray Frush
> > Colorado State University.
> >
> >
> > On Sun, Aug 6, 2017 at 6:10 PM, Bzzzz <lazyvi...@gmx.com> wrote:
> >
> > > Hi backuppcers,
> > >
> > > I'm gonna switch from v3 to v4 and have a question about it:
> > >
> > > * doc says hardlinked files inodes are stored in each backup tree,
> > >   I guess that BPC partition being formatted in XFS, any optimization
> > >   (that might move any file) of this partition is out of the
> > > question ?
> > >
> > > Jean-Yves
> > >
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> >
> >
> >
>
>
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