Hi, thank you for your question! If you've backed up a lot of files over the years, you may have lost track of what exactly is stored on the Samsung Cloud server. No worries, you can easily access your device backups using either your phone, tablet, or a computer. After you've signed in to the Cloud, you can view your data or delete anything you may not need. This link here will help you access and navigate Samsung Cloud: https://www.samsung.com/us/support/answer/ANS00060518/
Please let me know if this helps!