On Sun, 30 Oct 2022 20:06:59 +0000, David T-G
I'd love to use GPT, because I like its flexibility, but I think I could happily live with MSDOS partitioning because I only need
swap previous-version future-version data
partitions, which fits. [Am I right? I don't need a dedicated /boot slice, do I?] And I shouldn't need a backup because I'm trying to install to the new 256G sde, keeping the 128G sda around only for migration later, at which point I will replace it with another 256G drive and finish the mirroring. I think I do want to mirror, but let's talk about that below ...
You are not limited to just four MSDOS partitions. There may be three primary ones plus an extended partition containing multiple logical partitions. [1] [1] https://gparted.org/h2-fix-msdos-pt.php#basic-msdos -- Robert Webb