largefiles vs bundles

[Marcin Wiśnicki]

So I've learned the hard way that largefiles extension is completely
ignorant of bundles.

What is then the proper way to incrementally backup remote repository
with largefiles enabled ?

I thought about copying/rsyncing .hg/largefiles from local clone but I
don't know how to fetch all largefiles. There is a "--all-largefiles"
for 'clone' but I don't see a way to do it incrementally (with pull).