Yes, by default all branches are pushed, (you would have to use --force if it creates new heads, and --new-branch to push new named branches). But I really don'

Yes, by default all branches are pushed, (you would have to use --force if it creates new heads, and --new-branch to push new named branches). But I really don't see how it makes anything "server" or "client" side. (and you could in any case decide to push just default: hg push -r default)