A laptop backup plan using cygwin (gnu) tar and R/W CDs?

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Say someone owns a only laptop and doesn't intend to make any
equipment purchases for some time.  How does this strategy sound?

Identify the files and file trees that need protection.

Label 5 "weekly" read/write CDs a Week 1, 2, 3, 4, & 5, one for each
Suncay of the Month..

Label 6 "daily" R/W CDs as Monday, Tuesday, ... , Saturday (there is
no Sunday, since that is for the "weekly" backups).

Every Sunday, make a full backup of the identified files and file
trees onto the CD for that week of the month.

Every day, make an incremental backup of identified file trees using
corresponding daily CD -- any files changed or created since the last
full Sunday backup.

This two-level method gives you a way of going back a month.  After a
while, the daily R/W CDs will need to be replaced.

Since the CD writer writes at a constant speed, special precautions
are needed to avoid the problem of feeding data too slowly to the CD
writer.  Each backup must be broken into 2 steps: One to generate the
backup data file file to put onto the CD, and another to write it to
CD.  The backup data file can be compressed.

I will be using cygwin's gnu tar & gzip, and am reading up on using it
now.  However, I will not be able to use its scripts for incremental
backup because my version of cygwin doesn't have them.  Since I'm on
dialup, I will not be updating cygwin any time soon (assuming that the
scripts are even available on the newer versions).

Being unable to easily access the scripts, I will directly specify tar
switches for incremental backup.  Any pointers to a more explicit
description & examples of using the snaphshot file would be
appreciated.  For example, since the daily incrementals are being made
with respect to the last Sunday backup, do I need to copy the snapshot
file for Sunday So that Tuesday's incremental is not working with the
snapshot for Monday?

The backups may have to be done twice: Once for the administrator, and
once for user (I maintain one of each account so that I can use the
user account most of the time).

Comments on pitfalls and how to do things smarter are welcome.  In
case it matters, my HDD is 30GB, of which Windows 2000 and installed
applications take up most of the currently used 8GB.  The user account
(mostly in the cygwin file tree) takes up 1.9GB (3 CDs for the first
full backup).  while the administrator account takes up a mere 100MB.


Re: A laptop backup plan using cygwin (gnu) tar and R/W CDs?

Dubious Dude wrote:
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External USB drives are cheap and come in capacities such that you could
do 40 days (80 GB drive) worth of 1.9 GB backups, without having to
change CD's.

I have an AIT3 tape drive on my SCO server so I also dump the my USB
drives notebook backups to tape every so often.

Pat Welch, UBB Computer Services, a WCS Affiliate
            SCO Authorized Partner
            Unix/Linux/Windows/Hardware Sales/Support
            (209) 745-1401 Cell: (209) 251-9120
            E-mail: patubb@inreach.com

Re: A laptop backup plan using cygwin (gnu) tar and R/W CDs?

Pat Welch wrote:
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Hmmm, that's very interesting.  I will look into it, but extra
purchases are not on the horizon right now.  Having all the backups on
the same medium is a bit worrisome, too.  I know, even having them on
different media isn't all that much insurance unless one stores them
at different sites, but it does add a bit of protection.

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