Quotas are set separately for your home directory, each mailbox and database and define how many MB you can store in it. You can't upload and store more MB than the resource's quota allows (except for and ) and will get an error message if you try to do so. Periodically (e.g., every 5 min.) the system scans your home FTP directory, mailboxes and databases to see how much disk space is being used and updates the corresponding quota usage readings, so you can always check how many MB are being used by the resource and how many more MB can be uploaded.
To upload more MB than the resource's quota allows, you can increase it for:
Resources' quotas can be max restricted which means you won't be able to increase it any higher when this limit is reached. To check how much you can increase your quotas to, go to Billing > Online price and check the Max field in the quota's entry.