I dont know if yo joking but I considered it lol. Was hoping they had a smaller say 128gb and 256gb options lol

Permalite mentioned degradation in the files stored on it while just sitting there.  I looked it up and he's right, you could start losing that info in 5 years, so not a good long term solution.  Probably would need some way of doing it like Nintendo cartridges.

It's Ok the endless cycle of being lost and then gained, means they will still have you 50% of the time and since the cyclic nature of Rol being a MS customer is so quick it means they don't have to worry about lawsuits when  the inevitable day comes when Nintendo registers Rolstoppable as an IP.

SO whats the best way to backup your games (well mainly all the shitty patches and addns)

SO whats the best way to backup your games (well mainly all the shitty patches and addns)

Unfortunately just a large multi-terabyte hard drive and just swap games back and forth between it and the system for those that require the speed of the fast SSD.  Your older games wouldn't have to be switched back and forth but all games taking advantage of the Series X Hardware would.  This will still make it where you wouldn't have to delete any games and their patches if you have enough storage. I'm hoping for a larger card than the 1 terabyte that will be available and will purchase it.  Then just keep a 3 terabyte external drive plugged into a usb for the backwards compatible games and extra new gen games. Moving the new generation games back and forth probably won't occur often, but when I do it will still be a lot faster than having to re-download it and dlc.

edit: I just found an 8TB 3.0 usb for $145.  I'll probably upgrade from my old one.

The Xbox Series X has only 2x PCIe gen4 going to the internal SSD and  2x PCIe gen4 going to the external expansion slot. So not identical to PS5 on that front.

source: https://www.tomshardware.com/news/microsoft-xbox-series-x-architecture-deep-dive

the expansion card is also only 2x PCIe gen4

source: https://www.hardwaretimes.com/xbox-series-x-storage-expansion-will-use-pcie-4-0-x2-seagate-reveals/

https://www.seagate.com/au/en/consumer/play/storage-expansion-for-xbox-series-x/

Dont forget about the PS5 digital for $400 and with 825 GB ultra fast SSD, exactly matching its full fledged sibling. Now all of a sudden, a PS5 with 70% more capacity, 2.5 times the GPU power, and 60% more and faster RAM sounds like a MUCH better deal.

Wouldn't it be a waste to use 4x PCIe gen4 for the use case scenario?

2x PCIe gen4 already can handle ~4 GB/s and the maximal transfer is 2.4 GB/s.

It would even allow ~50% faster SSDs in later Xbox Series revisions or in later Seagate-Xbox-expansion SSDs (f. e. 3.6 GB/s uncompressed data)

I wouldn't say it's that expensive. I recently got a good deal on a 1TB laptop SSD for £178 which is fairly much the same price as this Seagate one in USD. You can also get an M.2 1TB one for £120, or about $160 for your desktop, though I notice that that one has theoretical speeds only half as fast as what the Seagate can manage. 

That said I'm 100% not buying one anytime soon. I have a WD Black HDD 4TB which transfers at 130MB/s. (versus 3000-4000 MB/s for the seagate SSD). At that rate you could move the entirety of Call of Duty Modern Warfare (200GB) from the USB drive to the internal SSD drive in 25 minutes. And that's ignoring the fact that you'd be able to play Modern Warfare, and all other Xbox One games, from the USB drive directly. I'll get one much later when there's more next-gen games to play and when the prices come down.