Usually data / persistence layer is not stored in Docker images directly. Frequently the data directory is marked in containers as a "volume" to bypass the usu

Usually data / persistence layer is not stored in Docker images directly. Frequently the data directory is marked in containers as a "volume" to bypass the usual CoW filesystem and write directly to the backing filesystem. So, it's uncommon to snapshot DBs directly in Docker and likely (this is pure speculation) 'zfs snapshot' is more efficient than 'docker commit' (on disk space usage and/or speed of snapshot) for this workload due to different use cases. I'd be really curious to see some actual numbers on this though.