Hi Milek,
I specifically don't want to destroy the oldest snapshot because I already know 
it won't free up much disk space, since it is sharing most data with the 
current fs. If I delete it I will have lost any old data which might be needed 
for recovery (eg. if I accidentally corrupt some files). I don't know which 
snapshots which actually free up the space.

> In most cases you probably want to destroy an oldest
> snapshot. Then
> check if you happy with your free space, if not
> delete a next one and
> so on.
> 
> The problem is how to present the information you are
> asking for, like
> - how much space will I regain if I delete snapshot
> #2 #4 #7....
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