Path: utzoo!mnetor!uunet!swlabs!csd_v!bak
From: bak@csd_v.UUCP (Bruce)
Newsgroups: comp.unix.questions
Subject: incremental backups using cpio...HOW???
Message-ID: <155@csd_v.UUCP>
Date: 19 Jan 88 02:54:32 GMT
Organization: Computer Systems Design -- Sandy Hook, Ct.
Lines: 30
Keywords: incrmental backup cpio

This is article is being reposted.  It was originally cross-posted
to comp.unix.microport and both postings disappeared into bit-ether.

(BTW The last posting to ...micrport to reach this site was dated
December 30, 1987, but I just saw a posting by Plocher to ...xenix, so at
least HEe made it into the new year, even if his moderated newsgroup hasn't.)

Anyway here's my question (with apologies to any who have already seen it):

I have a problem with backups that I've never seen mentioned anywhere
on the net and I'm wondering if I'm missing some very obvious solution.

I wnat to do multi-volume incremental backups.  My version of tar
( microport 2.3 sys V ) doesn't support multi-volume archives.  So that
leaves me with cpio.

My problem is that once an archive has been created say via

$ /bin/ls /usr/bak/src | cpio -oBvc >/dev/dsk/0s25

any subsequent invocation of the same command recreates the archive
instead of adding to it.  So that if I've deleted files form /usr/bak/src
since the previous backup, I lose them forever.  Is there some way that
I can add files to a cpio created archive that I don't know about?

Thanks in advance for all help in this matter.
-- 
  Bruce Kern                                 |  uunet!swlabs!csd_v!bak  
  Computer Systems Design                    |  1-203-270-0399          
  29 High Rock Rd., Sandy Hook, Ct. 06482    |  This space for rent.