>> Interesting idea but it will then do more compression than it's needed - for 
>> example, Bacula needs to compress only new/modified files. In the way you 
>> suggested, kernel will need to compress everything again with every 
>> VirtualFull backup.
>>
>
>Most of the filesystems that compress do that on a block level. So it
>will not recompress the entire disk volume when you append.


But VirtualFull is creating new volumes from old volumes so kernel will need to 
compress it again. Bacula not.

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