we often setup new standby databases or made copies for new development databases.
Here we use the rman duplicate command.
In a lot of situations we have the requirement to do the setup for a special point in time for example until 9:00 a.m.
But the "until" clause can't be used for active database. So we always have to do a backup on disk for example and then start the duplicate.
To do a duplicate without the backup on disk would save a lot of space and time and administration around these jobs.
If it would also work with pluggable database it will be excellent.