INFO: Using pyudev version: 0.24.1
INFO: udev observed remove of pool testbackup2
INFO: udev observed add of pool testbackup2
INFO: Pool testbackup2 has been added to queue. Starting backup...
INFO: Plugged in disk testbackup2 that is matching configuration:
{
  "pool_name": "testbackup2",
  "zfs_tag": "testbackup2",
  "autobackup_parameters": [
    "-n",
    "-v",
    "-d",
    "--strip-path=1",
    "--allow-empty",
    "--clear-mountpoint",
    "--set-properties readonly=on",
    "--keep-source=10,1d1w,1w1m,1m1y",
    "--keep-target=10,1d1w,1w1m,1m1y",
    "testbackup2",
    "testbackup2"
  ],
  "passphrase": ""
}

Starting the backup now. You will receive an email once the backup has compled and you can safely unplug the disk.
INFO: Email sent successfully to ['***']!
INFO: Importing pool testbackup2
INFO: Starting ZFS-Autobackup for pool testbackup2 with parameters:
zfs-autobackup-n -v -d --strip-path=1 --allow-empty --clear-mountpoint --set-properties readonly=on --keep-source=10,1d1w,1w1m,1m1y --keep-target=10,1d1w,1w1m,1m1y testbackup2 testbackup2
usage: zfs-autobackup [--help] [--test] [--verbose] [--debug] [--debug-output] [--progress] [--utc] [--version] [--ssh-config CONFIG-FILE] [--ssh-source USER@HOST] [--ssh-target USER@HOST] [--property-format FORMAT]
                      [--snapshot-format FORMAT] [--hold-format FORMAT] [--strip-path N] [--exclude-unchanged BYTES] [--exclude-received] [--no-snapshot] [--pre-snapshot-cmd COMMAND] [--post-snapshot-cmd COMMAND]
                      [--min-change BYTES] [--allow-empty] [--other-snapshots] [--set-snapshot-properties PROPERTY=VALUE,...] [--no-guid-check] [--no-send] [--no-holds] [--clear-refreservation] [--clear-mountpoint]
                      [--filter-properties PROPERTY,...] [--set-properties PROPERTY=VALUE,...] [--rollback] [--force] [--destroy-incompatible] [--ignore-transfer-errors] [--decrypt] [--encrypt] [--zfs-compressed]
                      [--compress [TYPE]] [--rate DATARATE] [--buffer SIZE] [--send-pipe COMMAND] [--recv-pipe COMMAND] [--no-thinning] [--keep-source SCHEDULE] [--keep-target SCHEDULE] [--destroy-missing SCHEDULE]
                      [BACKUP-NAME] [TARGET-PATH]
zfs-autobackup: error: unrecognized arguments: testbackup2 testbackup2
INFO:
INFO: Setting pool testbackup2 to read-only
INFO: Exporting testbackup2
INFO: Backup finished. You can safely unplug the disk testbackup2 now.

ZFS-Autobackup output:

INFO: Email sent successfully to ['***']!