Enterprise and Transcription Edition administrators can request an automatic email when their account is at or above 95% of storage capacity.
The warning email is sent after midnight Eastern US time, and goes to the email address of the administrator ID.
To have this option turned on for an account email support@mydocsonline.com and include your administrator [...]

You can instantly add more storage space to your My Docs Online account by logging into your account using the web browser interface (www.mydocsonline.com)  then clicking the“My Account” button.  Once you are in the My Account section just click “Add more space NOW” under the “Account Information” section.