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Re: [rdiff-backup-users] Incremental, automated, remote, secure

From: Grant
Subject: Re: [rdiff-backup-users] Incremental, automated, remote, secure
Date: Thu, 18 Jul 2013 08:05:00 -0700

>>> rdiff-backup preserves metadata in separate files so it doesn't need to
>>> be root on the storage node.  If you can make that work, you can avoid
>>> the rsync-to-root and use an rdiff-backup-specific non-root user.
>> I've been informed on this list before that rdiff-backup has
>> shortcomings when used to transfer data over the internet and it is
>> better to use rsync over the internet and rdiff-backup locally on one
>> side of the other.  I did find out that rsync --fake-super will store
>> permissions and ownership in ACLs so that negates the need for remote
>> root.
> Well, if you have that much extra space, perhaps.  I do rdiff-backup
> over the internet (as root on some box, to a non-root user on another
> box) all the time, and haven't had trouble.

Sometimes I'm on the road with my laptop tethered to my cell phone and
then I have trouble using rdiff-backup over the internet.

>>> The scary risk is silent corruption and losing old backups. So you need
>>> to keep periodic backups essentially forever.
>> If the clients rsync data to the backup server and the server runs
>> rdiff-backup locally on that rsynced data, and another system pulls
>> that rsynced data from the server and maintains its own rdiff-backup
>> repository, I think I should very likely be OK as far as corruption.
>> Offsite backups would negate the corruption threat completely I think.
>>  Does that sound right?
> No, but this is really hard.  What if the backup disk has bad bits in
> the block of some file?  What if the bits go bad on the machine being
> backed up?  What if you then diligently copy those bits for 2 years, and
> only keep 1 year of backups?

That's true, corruption really is still a problem.  What can be done?

- Grant

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