On Thu, Dec 08, 2005 at 12:05:40PM +0000, Russell Howe wrote:

> If you look at the recent "Project voting" email, I think this is what
> Kern terms "Base Jobs". In short, no, not yet, but it's planned I think.

Ah, thanks.  I've only just joined the list, but the archives have it.
"Base jobs" sounds similar, but not quite the same -- the intent of
this is to catch not only OS and apps, but even data files that are
identical (ie. a bunch of users have a copy of the same 50MB
powerpoint presentation), and it (should be) automatic.  Ie. after
archiving any file, you store the file size and the crypto checksum in
a DB, right?  If you later encounter another file with the same size
and crypto checksum, instead of backing it up, you put a reference in
your DB that says it's the same content as the earlier file.  Restores
may take longer, because files are spread out, but if the restore
software is smart, it should be able to reorder its queries so it only
needs to make a single pass over the backup media.

I've been using AMANDA for a while, particularly because it can easily
support bare-metal-recovery and it's free.  But I'd like something
that supports single instance storage, and has better support for
multiple volumes per backup.  Guess bacula isn't it, at least not yet.
:(

> As far as I know, yes. I'd check with the manual on this (I think there
> used to be performance issues with large numbers of hard links or
> something - not sure).

Thanks for the pointer.

It says the problem is for tens of thousands, which shouldn't be a
problem here.  The links aren't from BackupPC, they're from a local
script that only generates a few hundred links, for similar reasons
(ie. it generates a bunch of files, most of which are identical, and
if it notices two identical files, it deletes one and links it.)

- Morty


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