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Date:	Tue, 4 Apr 2006 14:11:59 PST8
From:	"Bob" <2lvvuss02@sneakemail.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: BACKAGAIN/2000 differential backups

** Reply to message from "Benedict G. Archerbga0@sbcglobal.net" on Tue, 4 Apr
2006 13:20:00 PST8

> The more frequent differential backups should be quicker and not require as
> much room on the tape because only files with unset archive bits should be
> written to the tape--at least that's how I read the manual. But what I'm
> finding is that differential backups take just as long as full backups and use
> just as much tape. I've verified that the full backup does set the archive bit
> as it's supposed to, but the differential backup doesn't seem to look at it.
> What have I missed, or anyone else notice this?

What you missed is there are two types of partial back-ups, "differential" and
"incremental".

Differential backs-up all files with the "archive" bit and does not reset the
archive bit.
Incremental backs-up all files with the "archive" bit and resets the archive
bit.

The difference is when you restore :
Differential you restore the "full" backup and the last "differential" backup.
Incremental you restore the "full" backup and all of the "incremental" backups
in order.

I use the "differential" method because it is easier to do the restore. I
think that which method you use depends on how many files get changed between
each backup. As you noticed the differential set keeps growing until you reset
everything with another full backup.

> In case it matters, using 4OS2 command processor.

Does not make any difference.

--
Robert Blair

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