Allow all hosts in prod backend.
Don't check if parent exited right at the start, not necessary since it's done
quickly afterwards anyway.
Write initial stub code for backup plugin backend.
Add cli for backup plugin.
Add backup plugin server. this is temporary and should be completely self
contained inside the plugin after v1.
Implement backup policy create and delete API
Update backup plugin data model. Introduce policy trail.
Add backup policy scheduler
Add backup policy trail view.
Implement enable/disable toggle for backup policy.
logger for backup plugin
implement policy trail backend
update backup model for trail updates.
Add utitlity methods for trail crud operations.
Add backup task worker.
add mount utitlity methods for backup task workers
policy trail updates should be simpler with just status message as input.
Remove trailing / for backup api end point.
Delete backup snapshots older than num_retain declared in the policy.
execute a new task even when the prevous one failed, but not if it ended up in
an inconsistent state.