I agree, being able to delete the snapshot that a clone is attached to would be 
a nice feature.  Until we get that, this is what I have done (in case this 
helps anyone else):

1) snapshot the filesystem
2) clone the snapshot into a seperate pool
3) only nfs mount the seperate pool with clones

That way, if I need to delete a file from the backups, I can delete it from the 
clones.  Since users only have access to the clones, they would not see the 
deleted files.  On the other hand, the deleted files still exist in the 
snapshots, so I am never 'corrupting' my backups.  Note, this only works for 
limited situations like mine I believe, not sure if there is a way to prevent 
users from having access to their .zfs/snapshot directory when they have local 
access to the zfs filesystem.

Paul
 
 
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