442 votesRD commented
duplicate accounts are avoidable if you can select another OneDrive account when installing a new device and product.
I had a shared home PC with all our video and pictures. My wife then got a Surface PC and set it up with her (different) MS account, she wanted all the photos on her Surface as well, so using an external HDD device she copied the files across. Now we have two OneDrive Accounts with almost the same content, since new pics and edits are not in sync.