Synchronize GRUB across multiple disks. https://r00t2.io/
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bootsync/README

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This mini-project allows you to maintain segregated ESP failover in a multi-disk setup.

If you have just one disk in your system, this project is useless to you. I promise.

The examples assume use of UEFI and GRUB2, but it can easily be tweaked to use other bootloaders with a little research and modification to the configuration (and commenting out/modifying the writeConfs() function; I'll maybe make that a little smarter in the future).