mhm... the communication can be saved... but if the call timer is included... mhm... i don't know ^^
(didn't take a look at that when i was updating my phone via nsu ^^)

edit: ok... i looked at my personal overview page at my provider's webpage... and it states that i talked 9 minutes this month... but my phone tells me that i talked 14 mins... and because the update was this month i can tell you that the timer is included in the backup