[pve-devel] Improve container backup speed dramatically (factor 100-1000)

[Carsten Härle]

>>Yes, that is how the current variable sized chunking algorithm works.
...  
"zfs diff" does not provide the information needed for our deduplication 
algorithm, so we cannot use that. 
<<

1) Can you please outline the algorithm?
2) Why you think, it is not possible to use the changed information of the file system?
3) Why does differential backup work with VMs?