What is the HyperV recovery snapshot type?

According to the CreateSnapshot there are two types of snapshot Full and Disc snapshot. But from MS samples (and MS patent)  i found that there is also SnapshotTypeRecoverySnapshot
with id 32768 and name "Microsoft:Hyper-V:Snapshot:Recovery". I found that it is created very fast. Much faster then full and it works well. Who know what is that snapshot type and what is difference from Full and disc? (I found that when i
create recovery snapshot - the snapshot tree isn't created)

There are recovery checkpoints created within the OS.
There are checkpoints taken when you select 'create snapshot / checkpoint'
There are VSS snapshots taken by the VSS writer for backup purposes.
Since you are talking full and disk - I will narrow back to VM checkpoints - these happen very quickly, they simply add a differencing disk into the virtual disk path.  And then all writes end up there.  Copy on write was the very old name for
differencing disk files.
In the API there is the current configuration, and then there are checkpoint configurations.  You don't query the configuration once and get the whole tree back.
A disk snapshot is equivalent to the VM not being powered on - no running memory state is captured.
Full is what is taken when a running memory state is included.
The recovery snapshot sounds like the VSS writer integration which has special hooks for Hyper-V that trickle the VSS snapshot action down into the VM.  So that applications int he VM can flush cache to disk prior to the capture of the backup. 
This is specific to backup.  Not the same as a VM checkpoint.
Brian Ehlert
http://ITProctology.blogspot.com
Learn. Apply. Repeat.

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