No don't. Even for just moving the toilet (to replace the wax seal underneath) you're supposed to disconnect the tank from the toilet, to make sure that the stresses on the bolts don't cause cracks in the porcelain. Toilets aren't held together all that well. I've been watching plumbing youtubes because I'm trying to fix a leak in one right now. It's not pretty.
Standing on the toilet seat is probably less dangerous than standing on the tank.














Linux has software raid built in. You use mdadm to configure the array. It's a bit confusing but not a big deal. You might want to ask for help when you get to that point. Alternatively if you want hardware raid, you buy a raid controller and plug the drives into it. IDK about really attempting either of these with a raspberry pi instead of an x86 box. I'd use a box.