Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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mediatomb creates mediatomb.db.backup by default and updates it every 600s
http://mediatomb.cc/pages/documentation
edit config.xml with
<storage> <sqlite3 enabled="yes"> <database-file>mediatomb.db</database-file> <backup enabled="no"/> </sqlite3> </storage>
mediatomb (optware) comes with inotify!
http://en.wikipedia.org/wiki/Inotify
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