app vault = space upgrade?

I noticed that the tank storage section is empty and there is a new “app vault” section, if we select/purchase say “vault lite” would that be added to our space/plan or replace it?

would we have the space and fees of our current plan +the 6TB of vault lite? or would our previous plan be replaced ? i rarely use much traffic usage but frequently have to delete things to make room ( I’m on the 3TB scorpion plan)