Backups



			    mkf




			  ABSTRACT

	  In this article we disscus methods of	backing
     up	and restoring data in Plan 9



Off-site backups

To take	a off-site (archived) backup, you may use  disk/mkfs
, for example:

  ; disk/mkfs -avpU -s /root /sys/lib/sysconfig/proto/allproto

Flag  a	means writing the archive to the output,  making  it
suitable  to pass the archive to a compress utility such as
bzip2.	U and  p means setting GID and UID of files as	well
as their premissions.  And finally,  v means show every	file
that is	copied,	it can be useful as a  progress	 meter.	  To
reduce	archive	file, we use  bzip2 since it offers a better
balance	compression ratio than	gzip or	other formats:

  ; disk/mkfs -avpU -s /root /sys/lib/sysconfig/proto/allproto | bzip -9 > /tmp/bkup.bz2

taking backups to a local disk is usually faster than  send-
ing  them to a remote storage (	 sshfs for example), because
of reduced rtt,	you may	copy the archive later with  fcp.



cwfs backups(?)

Consult	copyworm as described in fsconfig(8)

To automate backups, one might consider	mirroring  the	WORM
to a remote disk (but test, the	latency	may be unacceptable)








		     November 23, 2024