ZFS New to ZFS: transfered 8 TB, only 4.5 TB on disk? Really?

Were the TIFFs compressed originally? If not, good compression is very possible.

But really, the way to verify is to compare checksums between the original and copy.
 
Have a look at the compression ratio on the root dataset to see how much space compression is saving you overall:
Code: 
zfs get ratio,used pool
(ratio * used should hopefully be 8TB, or however much raw data is supposed to be on the pool)
 
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