This function validates destination by id.
Doesn't return any data.
jetapi backup -F validateDestination -D '_id=5b30da08d5ac5e06897b47e2'
https://hostname.example.com:2087/cpsess##########/cgi/addons/jetbackup/api.cgi?function=validateDestination&_id=5b30da08d5ac5e06897b47e2