Help me design a jellyfin media storage/serving solution please?

[Efficient_Good_5784]

For media storage, I have found a used 2-bay Synology DS214play for $80. I'm thinking maybe I can use that to run 2x10TB drives as RAID0 for extra read/write speed, since high bitrate rips are anywhere from 60-80Mbp/s I'm thinking it might not be viable to rely on a single HDD being fast enough to serve multiple files simultaneously?

Going with RAID0 will be useless in this case.

A single low-end 5400rpm HDD can output data at around ~120MB/s. That's the same as ~960Mbps. Going off of your numbers of a HQ rip using a max of 80Mbps, a single drive could theoretically output 12 streams.
Realistically, this number will be limited by the IOPS of the drives in your server and how each stream is accessing your drives. Not all streams will always start at the same time (and Jellyfin has a setting to limit how much of a buffer each stream can request), so you could have a bit more streams at the same time if they're staggered correctly to avoid a bottleneck.

You'll also probably be limited by the CPU if there's transcoding going on.

What if I were to use the second drive as a backup drive for my RAID0 array? How might i implement something like that?

You could set up an rsync task from one NAS to the other. 

I have also read about people using ZFS storage solutions and I have no idea how that works or whether it would make sense in my application?

ZFS is a file system (like how BTRFS is the filesystem that you can select in Synology NAS units). You can install ZFS yourself onto something like Ubuntu.
Most likely what you read about is using NAS software like Truenas or Unraid. Truenas uses ZFS to store your data, while Unraid recently added ZFS as an option.

A lot of people like using ZFS to store their data. You can look up online why. ZFS (like BTRFS) allows for things like snapshots, data scrubbing, and other benefits.

You can buy a pre-made Truenas system, or you can build your own Truenas server. For Unraid, you'll need to buy a license to install it onto a system that you have.


Finally, I don't know your situation with money, but I would suggest invest in a Synology unit that has more than 2 drive slots. You might end up filling up your drives and needing more space.
Also, I would advise not going with RAID0 on a 2-bay NAS. If you ever lose one drive, all that data is gone. If you run out of space, there's no way to add a new higher-capacity disk without losing the data.
If you go with a unit with more than 2-bays and use something like SHR on it, you can increase your storage capacity with just a single drive.