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50W is way more than I am willing to operate. I want it to be extremely low powered. I think that a 2.5 inch SSD might be a better fit for me then, maybe M.2 if there's a adapter for the PI.

SSD and low cost is still possible, but one has to make compromises in terms of storage size. A 1 TB network drive would be enough for my use case, be it 4 x 256 SSD's or one big.

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Peak power is significantly different from operational power on many of these setups. The intel setups, frequently idle at a 1/10th or less the rated power. The rpi4 OTOH, isn't nearly as dynamic, particularly if your running 64-bit debian. Its still just a few W, but its not going to drop down into the mW range when its idle because debian/etc doesn't have particularly good power mgmt on that board.

So in the end the rated W can be quite misleading, particularly for home use where the NAS will tend to sit idle a large part of the day.

Okay, but what I really wanted to say is that I want a very small and low powered NAS without a big PSU. The PI is powered over USB, that's fine for me.

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