Wakana

I have limited size in my server case and I want to use a 5.25 bay with an adapter to convert to 3.5 or 2.5 with hot plug. A 2.5 disk is more versatile, I can take it out quickly and use it in an external box. My idea is to use unraid with a pool of zfs with 4 ironwolf 2tb disks, but I can't have them in the array. So I want to connect the 2.5 disk and ssd to cache, to start the array. Use the 2.5 disk as snapshots of the zfs pool. I don't know if I can snapshot out of the zfs pool, using the 2.5 disk in the unraid array. I have two 3.5 ironwolf and ironwolf pro 4tb hdds available. You could use them for backup and not buy the 2.5 disk. What dou you recommend? I am somewhat new to this world and it seems that I am getting very complicated, but I would like to have zfs implemented on my server, for all the advantages it has. Sorry if I haven't managed to explain myself well, but I'm not very good with English.

Hey I'm looking for a 2.5 hard drive to use inside unraid as a backup. My idea is to buy a Seagate 2.5 external portable drive. And suck the disk to use it inside. Do you recommend that I do this, or better another type of more reliable disk?