Yes!
You need to ask yourself: What failure am I protecting myself against?
RAID1 protects against the hardware failure of a single disk. That’s good but it’s not good enough - because that is only one failure scenario among many failure scenarios.
Let’s say you accidentally delete a critical file. Your whizzbang 3.5 GB/s 2 x NVMe RAID1 drive setup will give effect to the deletion at lightning speed. If you want the file back, you need a backup.
Ditto some kind of application failure or other human failure that messes up / corrupts a file.
Ditto, dare I say it, some kind of malware, including but not limited to ransomware.
Ditto some kind of catastrophic event that destroys the entire computer e.g. house fire, theft.