[svlug] rsync and backup anyone?

[hvrietsc@yahoo.com]

see below...

On Fri, Jan 05, 2001 at 05:37:54PM -0800, Alvin Oga wrote:
> 
> hi ya...
> 
> donno if rsync has a feature to turn off "deletion"...
> 
> If rsync is used as backup of system_A.... i do not want the
> backup_system_BB to delete those same files...till some
> arbitrary time has passed...a day...a week...a month...a year...
> 	- some data you keep around longer than other data...
> 
> and yes... good that rsync uses "incremental algorithms"
> 
> i was (wishfully,stupidly) thinking... ( dreaming or not...conceptually...
> 	
> 	--- if the original file is 1Mb....and its changed....slightly...
> 	--- there is no reason to backup the entire 1Mb thing....
> 
> 	- the point is like rsync and others... that the differences
> 	is small and no need to save the entire file... just save 
> 	the diff patterns... ( and even if one gets hold of the backup...
> 	it does them no good... and its not even encrypted...
> 
> 	- this is/was my silly difinition(concept) of "differential backups"
> 
> 	mount backup:/Backup  /mnt/Backup   ( place to store backups )
> 	mount STABLE:/Stable /mnt/Stable  ( some place to compare against )
> 		- Stable is considered a usable full backup as of mm-yy-dd
> 	#
> 	# go thru a list of files.... since the last "stable full backup"
> 	# that will NOT change...
> 	#
> 	cd /home/<user>
> 	diff src/foo.c  /mnt/Stable/home/<usr>src/foo.c | tar zcvf /mnt/Backup/foo.diff.c -
> 	#
> 	umount /mnt/Stable
> 	umount /mnt/Backup
> 
> idea is there is a live full backup somewhere ( within the same building ? )....
> and only keep minimimal data on the incremental backups...
> 	-
> 	- remember...we're trying to backup 500Gb of live data...
> 	- and recover within an hour or two from a disk crash.....
> 	-

i you have that much data and that data is so important to you then 
all you can do is buy some real commercial backup product from a company
that will garantee it.

> 
> 
> have fun
> alvin
> 
> > Jeremy D. Zawodny wrote:
> > 
> > On Fri, Jan 05, 2001 at 11:17:43AM -0800, hvrietsc at yahoo.com wrote:
> > 
> > > I must admit i have not read all the many backup emails flying
> > > around but did anyone mention the use of rsync for backups yet?
> > > 
> > > (if yes then delete this message, if no keep reading if you want)
> > > 
> > > rsync will keep two (or more computers) in sync and will only ship
> > > differences across the wire so its real quick.
> > > 
> > > I know this is not _real_ backup, but having the same data on two or
> > > more machines does give some safety. I regularly run rsync between
> > > my desktop and laptop so that i have a full copy of my laptop (/etc
> > > /root /home /etc) just in case. after the initial rsync all
> > > incrementals are quick (due to rsyncs incremental algorithms).
> > 
> > Yep. I do something very similar at home. I have a couple of spare
> > filesystems on large hard disks. One is mounted as /backup/home and
> > another as /backup/root. I have a cron job in place to periodically
> > rsync so that if the real thing dies, I don't lose much data.
> > 
> > Hey hard drives are cheap... why not? :-)
> > 
> 
> 
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