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 {} \;
>
> --
> Wilcox-McCandlish Law of Online Discourse Evolution:
> The chance of success of any attempt to change the topic or direction of
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> the quality of the current content.
> My own blog is at http://www.zak.co.il/tddpirate/
>
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