To relocate OneDrive files to a different drive or folder (SD card, etc.):
1) Unlink OneDrive. (Find the Notification Area OneDrive icon, right-click, Settings, Account Tab, Unlink)
2) Exit OneDrive. Verify it is stopped (Find the Notification Area OneDrive icon, right-click, Exit)
3) Copy and paste your OneDrive folder to the destination.
4) Reboot. Start OneDrive (Search, OneDrive). Direct OneDrive to the new location.
OneDrive can take hours to verify that all of your files match the Cloud. It is best to keep a stable and fast Internet connection during the process, because the verification begins again from the start if your connection is broken. You are finished when OneDrive reports "Up to date." in the notification area.
Only after OneDrive reports "Up to date" should you delete files from the original location.