Monitoring Site Resources and Statistics in Plesk
You can keep updated on what you are using on your dedicated server and when
Which can aid you in allocating disk space, bandwidth, or email accounts to specific clients etc on your server.
It will also assist you in keeping your server up to date so if you need to upgrade, you will know before any issue arises
This information can be easily found in Plesk, via Windows or Linux hosting, you can find this information easily.