About the limit of storage

I need to have a PostgreSQL server with 10TB disk. I created a DB which contains three tables.

I understand that PostgreSQL has the following hard limit:

size per table: 32TB

size per DB: none

I wonder what I should do if the sum of my data exceed 10TB. It does not exceed any limit that PostgreSQL system imposes, but it does exceed my server's storage. Can anyone give a hint?

Thanks,

Sean