To view the size of a folder or document,
Open OneDrive (onedrive.northwestern.edu)
Click the Gear icon.
Click "Site Settings" in right-hand "Settings" panel.
On the Notification Settings page click on “More Settings” in the left pane.
Scroll to the “Features and Storage” area and click "Storage Metrics" on the "More Settings" page.
Click through the folders on the “Storage Metrics” page to see size information for folders and documents – start with the “Documents" folder and review the “Total Size” column.
Tips
The size of an individual document is visible via OneDrive without accessing the Storage Metrics page; however the only way to determine folder size is via the Storage Metrics page.
Click on the “Total Size” column header to sort files and folders by size.
The “Storage Metrics” page also provides information about version history, and is a fast way to delete unneeded versions of documents.
When moving or copying data from OneDrive there are limitations imposed by Microsoft.
Individual files larger than 15 GB cannot be moved or copied with the Move or Copy commands (although SharePoint allows upload of files as large as 250 GB).
Groups of files or folders larger than 100 GB cannot be relocated using the Move or Copy commands. Instead, move a smaller number of documents at a time, or create smaller sub-folders and move those.
The move command does not allow movement of more than 30,000 documents at a time.
Click here for more information about Microsoft limitations on moving and copying data https://learn.microsoft.com/en-us/office365/servicedescriptions/sharepoint-online-service-description/sharepoint-online-limits#moving-and-copying-across-sites
Click here for information about Northwestern solutions for moving large amounts of data from/between OneDrive and/or SharePoint using Globus Article - Using the OneDrive/SharePoi... (northwestern.edu)