On Wed, Dec 23, 2009 at 04:55:11PM -0800, Engel Sanchez wrote: > Hi Alex. My understanding could be wrong, but this is the scenario that I'm > trying to avoid: > > 1) Machine 1 has the original data and backs it up locally to /backup > 2) Machine 2 rsyncs /backup to local /backup every day > 3) Machine 2 is rsyncing /backup, and right then machine 1 dies for good > (fire, flood, apocalypse) > > At that point in time, machine 1 is dead and /backup in machine 2 is not a > valid rdiff-backup directory, so you can't restore your data from it anymore. > If Machine 2 was instead using rdiff-backup on the original sources, /backup > would have an incomplete backup, but previous data would not be lost, so you > can restore from it even if it was interrupted.
Very true, another example of different horses for different courses. At any one time I have 3 rdiff backup repos. 1 local machine, 1 local lan another machine and 1 different location. the rsync's are done in sequence, so if the source dies the off site one will have a complete backup. All this does is show how DR / Backups / HA (not all the same) have to be considered for each case. A > > Engel A. Sanchez > > > “Do what you love to do and give it your very best. Whether it's business or > baseball, or the theater, or any field. If you don't love what you're doing > and you can't give it your best, get out of it. Life is too short. You'll be > an old man before you know it.” > > > http://engelsanchez.net > > > > ----- Original Message ---- > From: Alex Samad <[email protected]> > To: [email protected] > Sent: Wed, December 23, 2009 6:32:37 PM > Subject: Re: [rdiff-backup-users] Safe to mirror backup dir with rsync? > > On Wed, Dec 23, 2009 at 01:58:30PM -0800, Engel Sanchez wrote: > > Thank you all for your suggestions! I'm going to go with the solution of > > doing cascaded rdiff-backups both pointing at the source directories and > > without rsync and simply spreading the cron jobs to avoid touching the > > sources while they are updated (the sources are hot copies of a couple of > > databases and a subversion repo). Using rsync and risking leaving the > > remote backup in a bad state didn't seem like a great idea to me. (Say > > rsync's connection breaks and original server fails before next backup). At > > least rdiff-backup can deal with a partially updated backup if also done by > > rdiff-backup. > > strange for the same reasons I have used rsync - I can capture when it > fails and restart and it doesn't need to roll back it continues where it > left off. rdiff-backup has to unroll and then restart so for a 2 hour > backup that fails in the last 10 min, you will need to do another 2 > hours of backup with rdiff-backup and only 10 min with rsync.... > > to stop the corruption problem right now I use semaphores around my > backup scripts to stop certain things happening at the same time :) > > Alex > > > > > Engel A. Sanchez > > > > > > “Do what you love to do and give it your very best. Whether it's business > > or baseball, or the theater, or any field. If you don't love what you're > > doing and you can't give it your best, get out of it. Life is too short. > > You'll be an old man before you know it.” > > > > > > http://engelsanchez.net > > > > > > > > ----- Original Message ---- > > From: Alex Samad <[email protected]> > > To: [email protected] > > Sent: Wed, December 23, 2009 4:13:16 PM > > Subject: Re: [rdiff-backup-users] Safe to mirror backup dir with rsync? > > > > On Wed, Dec 23, 2009 at 12:52:03AM +0100, Cybertinus wrote: > > > Hello, > > > > > > I'm using rdiff-backup to create the backups of my directories. It all > > > goes to /backup, which is a external harddrive. Then I'm using rsync to > > > mirror everything to /backup_sync, which is a second external harddrive. > > > This one is encrypted and I move it to an external location once a week > > > (and the disk from the external location then becomes the sync disk ;) > > > ). I'm using this strategy because when I swap the sync disks, they are > > > disconnected from my computer for a day. Some data I'm backing up every > > > hour, so I need a external drive at my computer at all times. > > > This system is working perfectly for me. The only thing I would > > > recommend is to prevent running rdiff-backup at the same time as rsync. > > > To prevent that your mirror is accidentally destroyed, because you would > > > by rsyncing incomplete rdiff-backup data. I haven't build in this > > > precaution in my backupscripts yet. For the time being I'm preventing it > > > from running at the same moment by choosing the correct times in my > > > cronjobs. > > > > Hi > > > > I am doing something similar. > > > > local machine rdiff-backup to /backup (lvm partition). > > then a rsync to the local backup server and at the same time a rsync to > > an offsite location - via adsl. > > > > I do this because my initial rdiff-backup can happen quickly and cause > > the lest disruption - if the source is on a lvm I can take a snapshot > > and use that but not all the sources are. > > > > I have come across one problem, if the over adsl takes too long the > > rdiff-backup destination on the local machine can change thus giving you > > a non in sync backup offsite. > > > > There is another thread asking for a tool to lock the destination to > > prevent this > > > > Alex > > > > > > > > Cheers, > > > Cybertinus > > > > > > On 23/12/09 00:03, Gavin wrote: > > > > Hi Engel, > > [snip] > > > -- Boucher's Observation: He who blows his own horn always plays the music several octaves higher than originally written.
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