backups using rsync
Ronald F. Guilmette
rfg at tristatelogic.com
Mon Mar 4 11:35:36 UTC 2013
As a result of this past Black Friday weekend, I now enjoy a true abundance
of disk space, for the first time in my life.
I wanna make a full backup, on a weekly basis, of my main system's shiny
new 1TB drive onto another 1TB drive that I also picked up cheap back on
I've been planning to set this up for some long time now, but I've only
gotten 'round to working on it now.
Now, unfortunately, I have just been bitten by the evil... and apparently
widely known (except to me)... ``You can't use dump(8) to dump a journaled
filesystem with soft updates'' bug-a-boo.
Sigh. The best laid plans of mice and men...
I _had_ planned on using dump/restore and making backups from live mounted
filesystems while the system was running. But I really don't want to have
to take the system down to single-user mode every week for a few hours while
I'm making my disk-to-disk backup. So now I'm looking at doing the backups
I see that rsync can nowadays properly cope with all sorts of oddities,
like fer instance device files, hard-linked files, ACLs, file attributes,
and all sorts of other unusual but important filesystem thingies. That's
good news, but I still have to ask the obvious question:
If I use all of the following rsync options... -a,-H,-A, -X, and -S ....
when trying to make my backups, and if I do whatever additional fiddling
is necessary to insure that I separately copy over the MBR and boot loader
also to my backup drive, then is there any reason that, in the event of
a sudden meteor shower that takes out my primary disk drive while leaving
my backup drive intact, I can't just unplug my old primary drive, plug in
my (rsync-created) backup drive, reboot and be back in the sadddle again,
almost immediately, and with -zero- problems?
P.S. My apologies if I've already asked this exact same question here
before. I'm getting a sense of deja vu... or else a feeling that I am
often running around in circles, chasing my own tail.
P.P.S. Before anyone asks, no I really _do not_ want to just use RAID
as my one and only backup strategy. RAID is swell if your only problem
is hardware failures. As far as I know however it will not save your
bacon in the event of a fumble fingers "rm -rf *" moment. Only frequent
and routine actual backups can do that.
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