IIRC JMone uses a Windows Server type deployment for his storage needs (correct me if i'm wrong) it's not just a bunch of drives plugged into a desktop.
I did a clean build of my Backup and Main PC earlier this year, so few things changed (but the basic concept remained).
OS: MS has slowly got rid of the lower cost "home" versions of Windows Servers over the years (I stared with Windows Home Server way back when). So my builds are now just around Windows 11. Until MS reintroduces the ability to format ReFS partitions in "normal" Windows (rumor is that is coming), I'm running Windows for Workstations on both my Main PC and the Backup Server. All my data drives are formatted as ReFS.
Drive Controller: I also replaced my SAS --> SATA controller as it was a bit of a janky setup and my expander died. I've purchased a 9305-24I for the Backup Server and a 9400-8i for my Main PC and both were pre-flashed in "IT Mode" so they just appear as HBA.
Drives: I tend to roll down my drives from my Main PC (that has 8 Bays) to my Backup server (20 Bays rack mounted cheapie case). When I need to expand my capacity, I'll buy and swap in larger drives on the Main PC 8-Bays and that drive gets rolled down into the Backup server. That said I did just retire all my older sub 10TB drives. I was getting issues on the 8TB "Seagate Archive" drives going "RAW" in the backup server... So time they went. I've stipped them down and they will be melted into something in my metal casting setup!
Pooling SW: DrivePool for Windows. Love it.
Monitoring SW: Hard Disk Sentinel. Love it.
Sync SW: I use Free File Sync to
manually push changes from my Main PC drivepool to the Backup server drivepool. Love it. It scans both pools and give you preview the difference between them so you can see what you are about to commit. I've had times where I've inadvertently deleted stuff on my Main PC and used Free File Sync to "bring to back".
Backup SW for Client PC: Went with Veeam to replace the Windows Server Backup for the OS HDD backups of the various PC (not for the Media Pool stuff). Seems to work well, giving both bare metal and incremental file backup/restore capabilities. It is free for home use. Have only used the File Restore (worked fine) not a bare metal restore (yet), touch wood).