Q. What will happen if I use the complete allocated web space ?
Ans: Your website will continue to work even if you reach the limit of your disk space quota.
cPanel will send automated email notifications once you reach disk quota limits. If you ignore those notifications your website will continue to work but incoming emails will get bounced and no new records will be added to your database.
Only solution to this is to upgrade to next web hosting higher plan for getting more disk space.
To upgrade your website hosting package please contact our Billing Department through HelpDesk or Live chat support.