I used to use Stablebit Drivepool until I migrated to unRAID.
Drivepool is great. You can easily use mismatched drives and you can have folder level duplication (I.E. set files to duplicate to individual folder). If the Drivepool becomes unreadable for whatever reason, you can just mount in and read the drive from almost any operating system. You can also combine it with Stablebit's DriveScanner and CloudDrive. The scanner will monitor the drives and begin to move data off automatically if the drive reports errors. The clouddrive lets you use cloud providers (such as Google Drive and Onedrive) as normal "hard drives" in your computer. You combine DrivePool and Clouddrive to combine online storage providers to create a single large drive.
I used to use Stablebit Drivepool until I migrated to unRAID.
Drivepool is great. You can easily use mismatched drives and you can have folder level duplication (I.E. set files to duplicate to individual folder). If the Drivepool becomes unreadable for whatever reason, you can just mount in and read the drive from almost any operating system. You can also combine it with Stablebit's DriveScanner and CloudDrive. The scanner will monitor the drives and begin to move data off automatically if the drive reports errors. The clouddrive lets you use cloud providers (such as Google Drive and Onedrive) as normal "hard drives" in your computer. You combine DrivePool and Clouddrive to combine online storage providers to create a single large drive.