I installed recently on a new PC, but dual booting with another SSD that still had Windows on it. You could always try using GRUB2 instead of BLS which I don’t think needs such a large boot efi - but I did get offered a 1gb one which I think will be fine for GRUB2, but I have seen people saying you might need more than that maybe 2gb or more on BLS. Also in terms of Backup using Btrfs allows for snapshots & roll backs. Here is a link to the file structure I ended up with from a post I did on this if it helps?
https://forums.opensuse.org/t/advice-on-setting-up-tumbelweed-on-a-new-pc/195110/24
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