Usually when a drive fails the SMART test or indicates SMART errors it means there may be problems with the drive and that drive may be going bad.
Creating a system report can sometimes take some time. Although 15 minutes may seem too long. If your My Cloud is already sluggish then that report generation could take a significant amount of time.
If the My Cloud is no longer under warranty one could remove the My Cloud hard drive from it’s enclosure. Connect it, using a spare SATA port on the computer or using a USB to SATA adapter, to a computer running Linux or running a Linux driver and copy the user data off the potentially failing My Cloud hard drive.
