Samsung closed down their own cloud service, and it seems they done some sort of deal with Microsoft as a backup facility. This suggests to me that it is not a "closed" backup service, and instead of backing up to OneDrive, you can also perform backups to other services, such as Box, Google Drive, etc. Probably, if you search online, somebody has figured out how to change the backup service away from OneDrive, and redirect it to an alternative of the user's choice.
