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Date: Mon, 17 Apr 1995 10:03:44 -0700
From: pascal@netcom.com (Richard A Childers)
Message-Id: <199504171703.KAA14764@netcom11.netcom.com>
To: questions@FreeBSD.org
Subject: trivial backup script
Sender: questions-owner@FreeBSD.org
Precedence: bulk


After a few requests for the backup script in question, I've decided to
post it for the use of those whom find it useful or a good starting place
for their own backup script(s).

A little bit of descriptive overview :

(1)	define some useful variables that will prove useful in labelling
	the tape ( see ft(1) ) and dump log with hostname, day, and time

(2)	create the backup image using your favorite utility and command-
	line flags

(3)	use the utility to verify the image - tar(1) is better at this
	that dump(8) or restore(8), but for system backups you probably
	don't want to use use tar(1) or cpio(1)

(4)	use dd(1) to verify the media upon which the image is stored

That's it. Nothing complicated ... just methodical.


===== cut here =====

#!/bin/csh -f

set	HOST	= `hostname`		# helpful w/ multiple systems or tapes
set	ROOT	= "/home/childers"	# this should be an absolute path
set	LOGDIR	= "${ROOT}/Backups"	# you will need to make this directory
set	STAMP	= `date +%y%m%d@%H%M`	# day-time-stamp to be used in logfile

# should note when backup was started, to calculate lapse
#
echo "backup of ${ROOT} started at `date` ..."

# cd to top of hierarchy to be backed up
#
cd ${ROOT}

echo "	writing backup tape of ${ROOT} ..."

###########################################################################
#
#	if you want dump(8) you'll need to replace this :
#
#		"^tar cbf 512k - ."
#
#	... with something like this :
#
#		"^dump 0sdbf 305 5000 512 - /dev/rsd0a"
#
#	... where "305", "5000" and "512" are experimentally
#	derived values which will not be defended here and now.
#
###########################################################################
#
# create tar tape
#
tar cbf 512k - . | ft "${HOST}:${ROOT} tar at ${STAMP}"

echo "	creating table-of-contents from backup ..."

###########################################################################
#
#	for compatibility with the above change, you'll need to replace :
#
#		"tar tvbf 512k -"
#
#	... with
#
#		"restore -tvbf 512 -"
#
#	...
#
###########################################################################
#
# re-read tar tape to insure readability
#
ft | tar tvbf 512k - >& ${LOGDIR}/${STAMP}_tar.toc

echo "	scanning backup tape for defects ..."

# reread media to insure freedom from defencts
#
ft | dd bs=512k of=/dev/null |& tee -i ${LOGDIR}/${STAMP}_dd.log

echo "backup finished at `date`"

exit

#
#	that's all, folks !!
#

===== cut here =====


-- richard

                    Good faith : see "Legal Fiction".
                    Legal fiction : see "Good Faith".

   richard childers        san francisco, california        pascal@netcom.com