Note however, that you can't use diff on binaries, [...] You absolutely can, but you need to use an external diff tool: fossil diff --command "compare" Yo

Note however, that you can't use diff on binaries, [...] You absolutely can, but you need to use an external diff tool: fossil diff --command "compare" You can also customise the diff-command variable. You might need to pass --diff-binary .. I forgot. As for storing binaries, unversioned files have no history, and are not synced automatically.