Samsung X5 1TB connected via thunderbolt 3 will probably be faster than the internal drive. (2500-3000 read-write) for 50% of the price of Apple's upgrade. So you will get 1TB extra instead 512GB extra for 50% less money.
I'd say Vega 48, since it's significantly better, especially for video. it's a nobrainer
you need a quantum computer
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no it doesn't, not anymore at least.
I have a superfast external NVMe SSD on a Mini with 512GB internal storage. Internal storage has 400GB free, i work mostly on the external now, since i can just disconnect it and have everything on a MacBook. + if anything goes awry, you don't need to jump through hoops to recover your work.
You do not understand how APFS Snapshots and other aspects of the current Mac OS work. I’m sorry but you just don’t.
APFS Snapshots allows a complete system restore in a few minutes (same as a Time Machine restore that can take many hours) just as I wrote. It only works with boot drives. This can be looked up. As often as you’ve written that this isn’t correct, the fact is that you are ignorant on the subject. Please look it up so that you give good advice in the future.
In addition, you seem to think that an NVMe external will be faster than that same drive on the internal PCIe bus if it goes over TB3. Again, you don’t understand how this works despite the number of people who’ve explained it to you. With Samsung, it’s the same blade that Apple uses except fo the pin-out. The 2015 iMac was different because Apple used an inferior NVMe 2 blade but they fixed this in in 2017. This is 2019.