Crucial gives a value of 320TB for the 1000GB. This means 175GB per day for the next 3 years. Under normal circumstances, this value cannot be achieved. Especially if you disable Windows defragmentation (not necessary with SSDs) and don't want to run a syslog server on it... Or install GTA V 2 1/2 times a day.

Why not use a washer or tinker one by yourself? Digitec does not offer such screws as far as i know. You will need a flat head M2x3mm screw.

We have just added your requested version to our assortment: Crucial MX200 (250GB, M.2 2260, 3.5" Bracket)

It's no good, just a slimmed-down minimal version. Important functions are missing. Take a look at Veeam Endpoint Backup FREE, which can do almost everything and costs nothing. It is also fast and has a useful GUI (unlike the new Acronis).

Here is the part needed to replace your 3.5" HDD with a 2.5" SSD: https://www.digitec.ch/fr/Comparison/245984-290020-445467

Is a different design and interface M.2 // Design: Solid State Module (SSM) - Form factor: M.2 2260 - Interface: M.2/B-M-Key (SATA 6Gb/s) - read: 555MB/s - write: 500MB/s