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Anthony Baxter wrote A thought I've had is that you could get a 'point in time' view with the current FileStorage by simply stopping reading after X bytes - since the file is just appended to, this will show the ZODB as it was at that state.

Hm. Looking closer at the code, ZODB.FileStorage.FileStorage already supports this - there's a 'stop' option that should be a ZODB.TimeStamp.TimeStamp(). Exposing this is actually not that hard - you'd need to hook into Zope/__init__.py to pass the arguments through (and making sure you go into readonly mode, or else strangeness will result). Course, a pack operation's going to mess this around rather a lot. Anthony