Just remember (ask me how I know!) that unlike a VM snapshot once you default or otherwise break a BE you cannot roll it back. You can only switch to a different BE.
So if you want to have that point remain available be sure to create a new BE snap each time before you run tests etc.
The upgrade process doesn't care or do anything special depending on the filesystem.
Honestly it would be faster and safer to just grab a backup and run the installer again to setup the mirror like you want. You'd be done in <10m with no worries about if you did something wrong.
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