DirectoryStorage 1.1.21

A ZODB Storage which uses one file per revision of an object

DirectoryStorage is a Storage for ZODB, the object database used by Zope. It
uses ordinary files and directories to store revisions of ZODB objects; one
file per revision per object.

The following features differentiate DirectoryStorage from other storages:
1. A very simple file format; one file per revision per object. Your data is
not locked away inside an unfamiliar, opaque database.
2. Designed for disaster-preparedness. Restore service after a disaster faster
and with greater confidence.
3. Storage Replication. Efficiently and robustly keep an online backup copy of
your storage up to date with the latest changes from the master.
4. Designed for fault tolerance. Any bugs (in DirectoryStorage, or elsewhere)
are less likely to irretrievably destroy your data.

And more ... look at http://dirstorage.sourceforge.net