Replacing boot drive, how to mirror?

Anyone have a link to instructions on how to mirror by boot drive to a new boot drive? I have looked, but I don't have the exact verbiage to get the instructions I am looking for. There's a lot of different but similar situations, and I am not sure what would best apply to me? This is a home lab and at the moment I'm running a fedora VM hosting plex. Media is on my TruNAS machine so not going to lose anything if I have to start over.

Thanks to l.leahu-vladucu for helping me narrow...

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