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http://forum.mikrotik.com/viewtopic.php?f=9&t=45209 A thread at mikrotik forum that gives some idea how to recognize skype traffic at the border of your network

http://www.halfgaar.net/backing-up-unix General notes about backup systems, useful when u need to explain something to other ppl, – use can use this notes instead of writing your own. (no info about “advanced” topics, like differential, incremental, reverse vs forward deltas, bare-metal recovery, check sums, etc. )