Thanks Chris. I ended up chickening out on Storage Spaces and ReFS. Having seen a fair amount of disk failures in my day, I was concerned what would happen if a disk (or worse a chassis of disks) failed. I saw where a few users reported various issues with ReFS. One person claimed a Windows Update to ReFS forced one of his drives to report as RAW. I was concerned about the ability to move the disks to a new Windows 10 machine and read from them. Further the fact that MS pulled ReFS from W10 Pro gives me pause. I got a refund on my W10 Pro Wkstn license from Microsoft and I am running DrivePool with NTFS and 2M blocks. I also have a SSD coming which I will setup for caching writes. I feel safe with the mirroring option but of course it's a lot more disks to spend money on. I also thought about deploying SS with parity (NTFS) and then pooling with Drivepool and using the SSD cache as well. I wonder about stability there and I still wonder about the ability to move the media to a new PC if it fails. It seems I have to rely more heavily on backups and at these sorts of data sizes, thats a lot of data to push to the cloud and it would take a good amount of time to restore it. Since you are a long time user of DP and have used ReFS and SS, I am curious at to your thoughts. You don't need to steer me to to the DP family just to get the sale. Frankly, I would buy the suite anyway just for some great advice. Prior to this project I have relied on hardware raid NAS units (Synology) but I chose to move to DAS for speed when converting media and to reduce network traffic and complexity. Having worked with Windows client and server products for a long time, I question the reliability of SS vs a hardware raid company like Synology. Thanks!