Well, if you’re storing data you care about on your server you kind of need to have redundancy. The best filesystem for that (imo) is ZFS so yes, you should use that (or something similar). Apparently you do use a “scalable storage solution” but you also seem fond of mystery.

If one of the raidz drives is removed from the array, and you’re not encrypting your datasets, someone could recover data from the drive.

The solution is in the question. Just encrypt the dataset.