Thx for your answer. I think, capacity is currently more important than speed. The idea of starting with a 3-drive-z2 sounds interesting but will cost more than a mirror with the same capacity. Maybe, I start with a mirror and wait how my users will fill it up to decide whether the next increase will be a z2-vdev with 3 drives, a second mirror or even a z2 with 6 drives.

But I see the point of just using one z2-vdev and adding new drives as needed. I would have more capacity in the end, but all drives need to have the same capacity. Or, if I start with a 10 TB mirrored vdev and add a second 20 TB mirror after 1 year, and 40 TB mirror after 2 more years or replace the first mirror with larger drives after many more years.

I fear, what likely will happen is that I will start with a single disk vdev, because my users don’t want to pay for redundancy. And only after some years, they see the value of it.

It is nice to read that PaperWM is usable again. I need the Gnome fearures, too.