Re: Utility for backing up/archiving to DVD-R? [REPOST]
From: Paul Lutus (nospam_at_nosite.zzz)
Date: 10/15/04
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Date: Fri, 15 Oct 2004 09:20:28 -0700
John Stumbles wrote:
> [Sorry for repost*]
>
> I'm looking for ways to back up and archive data to DVD-R and CD-R[W]. I
> have more data (including 10s of Gigs of audio and digicam files) than
> will fit on a single DVD-R, so they need to be split over multiple
> disks. The data keeps growing :-) but since DVD-R doesn't seem to
> support multisession in the way that CD-R does (haven't tried with DVD+R
> yet) it might be better to make incremental backups to CD-RWs until
> there are enough to fill another DVD-R (could do that bit manually).
Solution: Create an archive file using tar, split it into 4.7 GB chunks
using "split". Burn the files to separate DVDs. Number the CDs.
> I would prefer the data on the DVDs/CDs to be plain files so they can be
> extracted or accessed directly from the disks without the use of any
> special restore tools.
Okay, you have more data than can fit onto one DVD, but you want the files
on each disk to be in accessible form, like a normal filesystem. This is
not really feasible unless you have a meta-directory that knows which files
are on which disk, undercutting your originasl goal that the DVDs be
accessible as ordinary filesystems.
> (I could live with having to look up the name(s)
> of the file(s) I want from a table[1]).
>
> I also want to record the state of (all or part of) the filesystem I'm
> backing up so that I can restore it (using some special restore tool) to
> a given state (probably the state at the last backup, but possibly the
> state at the backup before the disastrous oops which silently corrupted
> half the files :-))
You can do this by joining the split files and reconstructing the original
filesystem using tar -x, but to do this, you will need as much extra space
as the original files required (or at the very least, the size of the
cumulative compressed file size).
>
> I'd like the system to be automatic (e.g. run from cron) so the backups
> do get done. I accept that I may have to manually put blank disks into
> the drive :-)
Okay. You want to save a large data store that requires more than one DVD,
you want the data to be in filesystem format on the DVDs, and you want this
all to happen automatically using a cron schedule.
Who is going to put the DVDs in the drive? Have you really thought through
your list of requirements?
> Also for some of the data sets I want to be able to make separate copies
> on DVDs or CDs, which will also have to be split over multiple disks.
Okay, okay, I get it. Best of luck.
-- Paul Lutus http://www.arachnoid.com
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