Booting over SSH with a snapshot

┌───────────────┐  ssh   ┌───────────────┐
│ fedora-33.img │───────▶│ qcow2 file    │───────▶ qemu
└───────────────┘        └───────────────┘
 remote server                    local machine

qemu-img create -f qcow2 \
         -b ssh://remote/path/to/fedora-33.img snapshot.qcow2
qemu -drive file=snapshot.qcow2 ...