Years ago I bought a Drobo FS (no longer made, but more-or-less equivalent to the Drobo 5N they sell today.) It’s a nice little package using Drobo’s very easy-to-use RAID system, combined with a Linux-based file-server. Drobo gave it the ability to have other applications installed on it (they call them DroboApps). I installed rsync, so that I could use it (with the magical “–link-dest” option) to do Time Machine-like backups of my desktop Windows PC. Once I got this all working, I was delighted… for about a week.
Then the Drobo started making my life miserable.