On Sun, 22 Oct 2006 15:39:14 -0500
Michael Sullivan <[EMAIL PROTECTED]> wrote:
> On Sun, 2006-10-22 at 12:44 -0500, Jim Reimer wrote:
> >
> > Instead of deleting from the previous weeks tarball the files that
> > haven't changed, why don't you just make this week's include only the
> > files that have?
> >
> > tar --after-date
> > tar --newer
> > tar --newer-mtime
> > etc.
> >
> > --
> > -jdr-
>
> Because a Sunday's full backup needs to stay a full backup until the
> following Sunday when another full backup is made, in case something
> goes wrong. That's why they're made once a week. Unfortunately, I
> can't afford the storage (blank CDs or places to store the CDs after
> they've been written), which is why I do it this way. I don't edit an
> older full backup until I have a newer full backup.
Either we're not getting something here, or you aren't. Rather the
latter. You do full backups on Sundays and incrementals in between.
That's just what the --after and --newer options will do for you.
Quick and dirty solution with cron:
0 1 * * 0 root rm /backup/full* /backup/incremental*
0 2 * * 0 root tar -cjvf /backup/full-`date +%Y-%m-%
d`.tar.bz2 /what/you/want/to/backup
0 2 * * 1-6 root tar -N `ls /backup/full* | sed -rn
's/\/backup\/full-(.*).tar.bz2/\1/p'` -cjvf /backup/incremental-`date +%
Y-%m-% d`.tar.bz2 /what/you/want/to/backup
This would delete your backups at 1 on sunday, make a full backup at 2
on sunday, and do incrementals at 2 each day except sunday. The date
when a backup was made is stored in the filename, and in case of a full
backup it's parsed out and used as a value for the --newer option to
tar.
Of course, it would be much more elegant to write a script that does
all this instead of having a hardly intelligible line like this in your
crontab.
Cheers
--
Horror Vacui
War Is Peace
Freedom Is Slavery
Ignorance Is Strength
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