usage: juju-restore [options] <backupfile.tar.gz>
purpose: Restore a backup made with juju backup

options:
--constraints  (= )
    set model constraints
--debug  (= false)
    equivalent to --show-log --log-config=<root>=DEBUG
--description  (= false)
    show the purpose of this plugin
--log-file (= "")
    path to write log to
--logging-config (= "")
    specify log levels for modules
-m, --model (= "")
    juju model to operate in
-q, --quiet  (= false)
    show no informational output
--show-log  (= false)
    if set, write the log file to stderr
-v, --verbose  (= false)
    show more verbose output

Restore restores a backup created with juju backup
by creating a new juju bootstrap instance and arranging
it so that the existing instances in the model
talk to it.

It verifies that the existing bootstrap instance is
not running. The given constraints will be used
to choose the new instance.