Shouldn't be a problem.
https://learn.microsoft.com/en-us/troubleshoot/windows-server/backup-and-storage/mirror-system-boot-partition-raid1
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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I am moving an IDE drive from a customer's old desktop into his new one. I want backup the old drive (drive 1) to a new drive (drive 2) before moving it to the new computer. Afterwards, I want to setup a RAID 1 array using both drives 1 and 2 so that there will be a backup when drive 1 eventually fails. I plan to use the Windows disk management utility rather than a physical array.
Is there a way to setup mirroring with a drive that already has data on it?
Shouldn't be a problem.
https://learn.microsoft.com/en-us/troubleshoot/windows-server/backup-and-storage/mirror-system-boot-partition-raid1
--please don't forget to upvote
and Accept as answer
if the reply is helpful--