There a particular reason you wanted Legacy / BIOS mode?
MBR2GPT makes the UEFI conversion easy and can even be run from the OS while it’s running. We get an image backup first, but we’ve never had to use it.
There are occasionally complications getting it to actually run, but those are usually when the disk is full when folks have a really weird nonstandard partition arrangement.
There a particular reason you wanted Legacy / BIOS mode?
MBR2GPT makes the UEFI conversion easy and can even be run from the OS while it’s running. We get an image backup first, but we’ve never had to use it. There are occasionally complications getting it to actually run, but those are usually when the disk is full when folks have a really weird nonstandard partition arrangement.