File system backup at night

[54394gt at hocda.UUCP]

Dave Henderson (try pads!dmh) has a filesystem backup scheme that is invoked
from cron.  I put up a simpler system on spastic and sps.  They use a shell
script to log off any users left on with kill -1 commands.  Then they
unmount filesystem(s), run 'fsck', then 'dd' to unused disk filesystem
slots.  Dave's scheme does a full pack-to-pack copy on machines with multiple
disk drives.  The script finally remounts filesystem(s).  When Dave gets to
work, he swaps disk packs (that means going single-user a few minutes).
We do not backup the entire disk, so we can 'volcopy' the disk to tape
during the working day.  This may not be as nice as using /etc/dump, but
it does work.
	George T., spastic!grt and others