Change SharePoint Migration Manager temporary file storage location

If using Migration Manager to migrate on-prem files to SharePoint Online, the tool temporarily caches files on the C drive during the copy process. If there's not enough free space on the C drive, the migration will fail.

To change the storage to a different drive:

1. In Command Prompt, navigate to the Migration tool folder:
   
   cd C:\Users\(user)\AppData\Roaming\Microsoft\SPMigration\Logs\Migration
   
   
2. Delete the exiting MigrationToolStorage folder.
3. Create a directory junction to a folder on a different drive:
   
   mklink /J MigrationToolStorage E:\MigrationToolStorage