Data and files that are of use to departments may be stored in primary Department shares (\\letnet.net\fs\departments) for use by the wider department (which have a 50GB quota).
OneDrive for Business is available as well for cloud-based storage for very large files subject to government and LETU policy limitations on what may be placed in OneDrive for Business. See https://wiki.letu.edu/x/QgBUAg for more information about how OneDrive for Business may be used.
If you would like to learn more about what is currently taking up space in your MyDocuments, WizTree is an excellent program for visually seeing how space is used. It is available at http://antibody-software.com