Path: utzoo!mnetor!uunet!steinmetz!davidsen
From: davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr)
Newsgroups: comp.unix.questions
Subject: Re: incremental backups using cpio...HOW???
Message-ID: <9478@steinmetz.steinmetz.UUCP>
Date: 9 Feb 88 17:05:26 GMT
References: <155@csd_v.UUCP> <10048@ncc.UUCP>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric CRD, Schenectady, NY
Lines: 23
Keywords: incrmental backup cpio

In article <10048@ncc.UUCP> lyndon@ncc.UUCP (Lyndon Nerenberg) writes:
| 
| This is a Q&D hack I've used for quite some time...
| 
| #!/bin/sh
| cd /usr/src
| find . -type f -a -newer /etc/local/lastinc -print | cpio -oacvQ /dev/rmt0
| touch /etc/local/lastinc
| exit 0

The problem with this is that there is a window in which a file may
change after being backed up and before the bulkhead file is touched. I
was bitten by this (just) once and use:
	touch marker.new
	find /u -newer marker -print | cpio -oBc > /dev/whatever
	mv marker marker.old && mv marker.new marker

Obviously I had to create the original marker file with touch, then do a
backup of some kind.
-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {uunet | philabs | seismo}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me