I just received a special offer from Sun (marketing...) promising that
I will learn "How to use ZFS snapshots for backup and restore
purposes."  The relevant doc is at...
https://www.sun.com/offers/docs/zfs_snapshots.pdf

It says:

=== Begin quote ===
Archiving and Restoring Snapshots

Another use of snapshots is to create archives for long-term storage elsewhere.

In the following sequence of commands, we send the snapshot into a
file and then compress it. It can then be
retrieved from the file when required. This is also shown:

# zfs send pool/filesys...@thursday > /var/tmp/thursday.snap
# gzip -9 -v /var/tmp/thursday.snap
# zfs create pool/thursday
# gzip -d -c /var/tmp/thursday.snap.gz | zfs receive -F pool/thursday
=== End quote ===

There have been several threads on this list saying not to do that.
It seems that this guide aimed at new users is inviting people to do
things that will lead them to unsympathetic ears if things go poorly.

-- 
Mike Gerdts
http://mgerdts.blogspot.com/
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