tldr is good for this.

https://tldr.sh/

2 disks in the same machine is not a backup whether the data is copied between them using RAID or rsync or anything else.

Sounds like for this machine, just use the two disks in RAID1, or a ZFS mirror, or something. And figure out something else for backups. Probably a cloud solution.

Also, RAID2 requires a minimum of 3 disks, and is rarely used.

These list also make you a likely target for scam calls.