Looking to export a server to an external drive, wipe, and copy back

[Arwen]

Gee, I just wrote up command line pool cloning in another thread:

@Arwen

zfs snapshot -r ${MY_SRC_POOL}@${MY_SNAP}
zfs send  -Rpv  ${MY_SRC_POOL}@${MY_SNAP} | \
  zfs receive -dFu ${MY_DEST_POOL}

zfs destroy -rv ${MY_SRC_POOL}@${MY_SNAP}
zfs destroy -rv ${MY_DEST_POOL}@${MY_SNAP}

Replace ${MY_SNAP} with a unique snapshot name. Then replace the pool names as well.

When done, you can export the original pool and rename the new pool to be the same as the old pool. That is covered in a Resource forum post if I remember correctly.