Recommended and mentioned products
State of the art, file based drive pooling software.
I store my media on a (windows 10) Stablebit Drivepool with x2 file duplication. (shucked HDDs are a bargain).
Download the latest FreeFileSync 10.4. FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
I backup weekly to external HDDs using FreeFileSync.