Hows the backup story with Hg nowadays? Git uses an immutable storage solution, so rebasing or other commands to alter history doesn't delete anything. Hg doesn

Hows the backup story with Hg nowadays? Git uses an immutable storage solution, so rebasing or other commands to alter history doesn't delete anything. Hg doesn't have the same architecture, so how does undoing histedit work? Genuinly interested, not trying to start a flamewar.