Where would you install the app(s), e.g. Jellyfin ? You cannot install anything on the boot OS drive. So the 1 TB drive is wasted. Get the smallest and cheapest you can find for the OS.
Installing Jellyfin on the HDD pool, will result in a less than stellar experience. Since Jellyfin (and also apps like immich etc) produce lots of small files.
Stay away from any “PCI to SATA” cards, that are not HBAs. These cheaply made cards often lead to problems, and data loss (!!), because they often use cheap components and port multipliers.
IMO for a 72 TB array, RAIDZ1 is risky business. Rebuilding a 72TB Pool after a drive died, will take a good while and your data will be non-redundant during that long and stressful time.
Combine that with that SATA card you chose, and the risk is very high for another drive to die or for the card to corrupt your pool. Then you have to downl^H^H^H^H^H sorry rip all you movies again !
Personally i would look for a case that takes a micro ATX board
- 8x SATA for your HDDs
- 10G ethernet on board !
- IPMI/BMC for remote management (thank me later!)
- m.2 for boot device
CPU
Xeon E-2246G (iGPU)
HBA for additional 2x SSD for apps, or put the 8x HDDs on this and use 2x SATA from the board.
RAM (bad time now !)
DDR4 ECC UDIMM
There you have a datacenter in a box !
I think 10 streams will be possible with that - but of course NOT 10 transcodes.