Le 03/06/2011 14:54, Andrew Schulman a écrit :
>> I'm about to set up a remote backup server to backup images of virtual
>> machines.
>>
>> What would the data transfer be (after the intial "sneakernet" transfer)
>> when a remote image gets updated/changed? Filename would not change, but
>> contents and maybe size would.
>
> An entire new copy of that day's VM disk image will be created each day.
> BackupPC doesn't compute or store diffs, if that's what you were thinking.
> All it can do is store a new copy of the entire disk image, if even one
> byte has changed in it.
>
> This is likely to be infeasible unless you have a very large amount of
> storage and transfer bandwidth.  When I set up BackupPC I quickly realized
> that the daily VM images were going to consume all of my backup storage in
> a very short time, so I added rules to exclude all of them.

The VM disk image are a binary file, they should be treated with a 
binary diff tool like xdelta. But I do not know if it's integrated into 
backuppc... ?

Regards.

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