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Can I suggest reading documentation instead of asking LLM's that are routinely known to just make shit up?
https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate says it's possible with a swap file as the backing device but that swap to zram isn't supported. I haven't personally tried it though.
So it IS possible, as I already found out. If the Arch wiki isn't saying things like "doing this can break your system" then it's fine by me.
you need a swap file, a swap subvolume, or a swap partition that's RAM + 50%, on account of zram. then you need systemd scripts that disable zram and enable swap on suspend and do the reverse on resume. also, you need some selinux tuning to allow you to write to said file. you have a detailed howto in Fedora Magazine.
stop using bullshitgpt.
edit: here's the article.
I mean, the swap file just has to be large enough to accommodate your system RAM. Everything in zram is already in system RAM, just compressed.
Okay, my concern was that if I have, say 1.4G in zram, that would unpack to, say, 2G, which, when added to 7G, would go over the 8G limit. I was worried that RAM might be saved in its uncompressed manner, when saved in the swapfile for hibernation.
I think the hibernation image is compressed by default (all of it). Also, some of what is in your RAM is just files from disk. I think those don't need to be saved into the hibernation image, since they're already on disk. For example, libc.so.6 would definitely be in RAM and in use, but it's also on disk, so no need to save it during hibernate.
So the hibernation image should be substantially smaller than your used RAM.
Ask on discussion.fedoraproject.org, there are many people doing similar things
I'd only use zram if I had no swap device/file.
In my experience zswap performs better, and doesn't get in the way of hibernation. In fact, most distros enable it by default today, and it doesn't always work so great with zram.