DS1019+ (2x Ironwolf Pro 12TB, 3x Ironwolf Pro 16TB, SSD cache, 16gb RAM)
DS1821+ (4x Ironwolf Pro 16TB, 1x WD 14TB, 1x Ironwolf Pro 12TB. SSD Cache, 32gb RAM, 10GbE.)
I've got a Minecraft server on each, 25ish docker containers on the 1821, and 5 on the 1019+.
The 1019+ now mostly just runs Plex and acts as a happy little hyperbackup vault for the 1821+, which has all my actual data on it.
Local PC's also back up to the 1019+ via Active Backup.
I started with the 1019+ and 2x 12tb drives to replace my Windows Home Server (yeah, an HP media smart from 2007) that had 4 drives in it with 12 years powered on time each. (WD greens believe it or not!)
Those little dudes went to Valhalla on the tip of a drill bit and EARNED it.