> its like saying sftp is delta transfer because you don't have to send your entire disk image every time I see your point, but the comparison to sftp seems re

> its like saying sftp is delta transfer because you don't have to send your entire disk image every time I see your point, but the comparison to sftp seems really off. Overlay2 [1] indeed works on whole file differences, just as sftp would do. Additionally, I don't think making actual byte-level deltas would yield you much improvement on container size. It would also increase access time unless you keep a cache that doubles storage requirements per image. Dockerfiles primarily add files rather than change them, and actual changed files are often small. [1] https://docs.docker.com/storage/storagedriver/overlayfs-driver/ https://docs.docker.com/storage/storagedriver/overlayfs-driv...