I just did a very cursed thing of zstd compressing an lvm logical volume, piping it over ssh, converting it to qcow2, and then importing it into proxmox
@wolf480pl I guess the only really cursed thing was converting the zstd compressed image to qcow2 using nbdcopy and qemu-nbd: serverfault.com/a/1153243
which turned out to not really matter much since it was the full image size instead of removing any unused space, so I could have just used unzstd instead and imported the raw image as-is