Microsoft’s service description for OneDrive for Business promises “beyond 1 TB, to unlimited” storage. In reality, most enterprise Office 365 accounts have 5 TB storage and won’t need to go further. But you can… first to 25 TB and then even more in the form of SharePoint sites. You just have to talk nicely to Microsoft support.
https://office365itpros.com/2020/05/22/onedrive-for-business-unlimited-storage/
