Question Add files to RAID 1 Nvme C Drive

[Vearax]

So I'm setting up my 2 nvme drives t o use RAID 1 with the C Drive. I have to remove this data to set it up so I backed up everything in a external drive but don't know how I will add it all back when I setup RAID because no operating system will be installed after I format it.

 

[rgd1101]

install os on the raid?