slightly OT - backup strategy

[Marc Volovic]

ZFS without raid (given that zfs itself functions as raid).

On July 17, 2022 5:14:07 PM GMT+03:00, Dotan Shavit <dotan at shavitos.com> wrote:
>Consider raid + zfs + daily snapshoots
>
>בתאריך יום א׳, 17 ביולי 2022, 16:50, מאת Shlomo Solomon ‏<
>shlomo.solomon at gmail.com>:
>
>> I recently lost some files because of a bad disk - hardware problem.
>>
>> I do regular backups so I was not really worried, but I now see that I
>> have a problem with my backup strategy so I'd like to know how others
>> handle/prevent what happened to me.
>>
>> I backup files using rsync and I basically have 2 types of backups.
>>
>> My most important files are backed up every night. I do incremental
>> backups using:    rsync -aqrlvtogS --ignore-errors  --backup
>> I keep about 4 months of backups. So if a file is damaged,
>> missing or accidentally deleted, I can find a good file - even if, for
>> example I screwed up the file and only discovered the problem a few
>> days later.
>>
>> BUT, all the rest of my files - music, videos, pictures, etc are backed
>> up daily and weekly on 2 different physical drives using:
>> rsync -qrlvtogS --delete --ignore-errors
>> I use --delete to prevent accumulating garbage on my backup disks.
>>
>> So here's the problem: Because of a hardware problem, several files on
>> one of my disks were lost. As a result, the daily backup script
>> "thought" that those files should be deleted from the daily backup.
>> Unfortunately, I did not notice the problem. A few days later, those
>> same files were also deleted from the weekly backup. So they are lost.
>>
>> So on one hand, I need --delete to avoid keeping backups of old
>> garbage, but on the other hand, the --delete option does not know if I
>> deleted the file or if it's gone because of a hardware problem.
>>
>>
>>
>> --
>> Shlomo Solomon
>> http://the-solomons.net
>> Claws Mail 3.17.5 - KDE Plasma 5.18.5 - Kubuntu 20.04
>>
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>>
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