Backup script (was Re: rsync problem)

[sammy ominsky]

Actually, with the possibility of nfs, my data could be anywhere and just mounted at /nas/web-backup :)

Also, the --link-dest= flag I use is the hard link snapshots you're asking about.  It creates a new generation of links each day, and keeps a rotating week of them.  It's not N backups, it's N generations of hard links.

sambo


On 22/03/2011, at 00:23, Omer Zak wrote:

> I see I follow a different backup policy from Sambo.
> 
> Sambo keeps the last N backups in the same physical hard disk (or maybe
> RAID array).  I keep a backup in a removable device.  My policy is to
> never trust a single interconnected system with my data (so that I'll
> not suffer massive data loss if my UPS+computer are fully zapped by
> power surge from the mains, or if the computer's hard disk goes kaput).
> 
> I have two removable hard disks, each one containing an almost full
> backup of my computer's filesystem.  I rsync to each of them in
> rotation.  Since I don't want to spend several hours on backup each day,
> this scheme allows me to keep only the two most recent backups (with
> rsync saving time by not copying over a file which was not modified
> since previous backup).
> 
> What I would like to have is a Time Machine (TM?) like scheme in which a
> backup disk will enable me to see a snapshot of my computer's disk from
> a certain date.  It can be implemented by making hard links.
> 
> Did anyone develop such a backup script?
> 
> --- Omer
> 
> 
> On Mon, 2011-03-21 at 21:34 -0400, sammy ominsky wrote:
>> On 21/03/2011, at 15:57, Omer Zak wrote:
>> 
>>> By the way, my own backup script uses the following rsync flags:
>>> rsync -avH --progress --max-delete=200000 --delete --delete-excluded
>>> --exclude-from=$EXCLUSIONS_FILE $FROM $TO
>> 
>> 
>> This looks like a fun game!  I'll show you mine if you'll show me yours.
>> 
>> #!/bin/bash
>> 
>> date=`date "+%Y-%m-%d"`
>> 
>> mkdir /nas/web-backup/Backups/${date}-incomplete
>> rsync -avP --exclude-from=/etc/rsync/web-exclude --link-dest=/nas/web-backup/Backups/current /nas/web/ /nas/web-backup/Backups/${date}-incomplete
>> 
>> mv /nas/web-backup/Backups/${date}-incomplete /nas/web-backup/Backups/${date}
>> chown -R www-data:www-data /nas/web-backup/Backups/${date}
>> 
>> cd /nas/web-backup/Backups
>> rm /nas/web-backup/Backups/current
>> ln -s ${date} current
>> unset date
>> 
>> # delete backups created more than 7 days ago
>> find /nas/web-backup/Backups/ -maxdepth 1 -ctime +6 -exec rm -rf {} \;
> 
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