How does this Email Storage solution help me stay within my purchased mailbox limits of 30GB or 50GB?

By deploying Vaultastic, a copy of every email is automatically archived in a secure, independent infrastructure. This allows you to safely delete older emails from your active mailboxes, knowing they are securely stored in Vaultastic. 

You can implement an automatic retention policy on your primary mailboxes, such as retaining emails from only the last two years and deleting the rest. This helps you manage mailbox size effectively, ensuring you stay within your purchased limits of 30GB or 50GB.