NVMe advice

[tabascosauz]

All 2TB, unless I made a mistake (amazon.com); the 4TB Red SN700 is $330

The SN750 does not seem available (on amazon.com); I have an SN550 500GB at the moment.

SN750 has been EOL a long time. Its successor was SN850, whose successor was SN850X. It's just that the newer SN700 is more or less an optimized and refreshed SN750.
SN550 is also EOL. It was succeeded by SN570, and in turn SN580. All rather incremental changes.

If prices are similar between SN700 and SN850X, going with the latter is pretty much a no-brainer unless you have a specific need for the doubled TBW rating.

 

[SPDIF]

I would go for an WD850 without the X at the end. Very fast, very efficient with power, price is not too high at moment. Also the SN770 is a good drive.
It will serve you for many years to come.

A read speed of 7.300 MB per second and available for below 100 dollar, capacity 1TB. Can't go wrong with these.

 

[Wirko]

$202 is quite a bit up on $140 for 2TB although the higher endurance is very tempting.

• WD Black SN770 $140
• WD Black SN850X $140
• WD Red SN700 $202
• WD Blue SN580 $120

Here are the prices at amazon.de for 2TB models (incl. 19% tax):
WD Black SN770: 135 €
WD Black SN850X: 159 €
WD Red SN700: 156 €
WD Blue SN580: 127 €

That's why I even mentioned the SN700. Also, still in Germany but at Mindfactory, the Seagate Game Drive PS5 is 158 € with heatsink. Same endurance as the SN700 but PCIe 4.0. Maybe of some interest to those rare people who have seen many WD disks fail in their lives, but not Seagates.

I'm not saying that I generally recommend those higher-endurance SSDs. They come with tradeoffs. Buy them if you need the endurance and know why you need it, otherwise not.

if you store fotos videos documents ... more than 128 GB , you should also have a HDD or SSD to manually copy them , just in case the NVME fails
or use RAID 1

That's commonly called "backup" and yes, of course it is necessary, even if you only have a few megabytes of important data.

RAID mirroring is not a replacement for a backup. It's nice if you need high availability (one disk dies but the array continues to work without interruption). But if data is lost or corrupted for any reason other than disk failure, RAID will help you nothing.