A Microsoft file hosting and synchronization service.
Hello Vancity_939,
Since you have already manually moved the files from old to new.
Go to the cloud One Drive and delete the Desktop, document, and Pictures to the recycle bin, not permanent delete, please.
It will stay there for 30 days before being deleted permanently.
Allow One Drive to upload fresh Desktop, documents, and Pictures.
Do your checks if everything is fine, then the ones in the Recycle bin are obsolete and it will delete itself. If you need anything from the old backup you have 30 days or at least a month to go check.