Interesting post-mortem on a near disaster with git - Mailing list pgsql-hackers

Over the weekend, KDE came within a gnat's eyelash of losing *all*
their authoritative git repos, despite having seemingly-extensive
redundancy.  Read about it here:
http://jefferai.org/2013/03/24/too-perfect-a-mirror/

We should think about protecting our own repo a bit better, especially
after the recent unpleasantness with a bogus forced update.  The idea
of having clones that are deliberately a day or two behind seems
attractive ...
        regards, tom lane