Depends on the docker containers but it’s way overkill than you might think.

Since you’re starting it may be worth looking into used office PCs like the thinkcentre from Lenovo or other brands(no tiny or ssf since they don’t have to room for drives). They often offer good perfomance for the price and the power consumption is not too high.

While browsing the manual you’re on point. I bet the 2 drives are plug into SATA3_A1 and A2. These 2 are handled by an ASMedia ASM1061

Buddy is selfhostig Matrix via Element server suite community edition and using element X on android as well as the normal element app on desktop. Never missed a notification, never