i made this experiment

i created a new event in the pc calendar
then
i ask to memotoo to sync calendars

then
memotoo sends all the events in the smartphone calendar and receive the new pc
event !

at least for calendar sync pc -> smartphone works 

server messages :

 calendar: starting slow sync, two-way (peer is client)
 creating complete data backup of source calendar before sync (enabled with
dumpData and needed for printChanges)
 Local data changes to be applied during synchronization:

 *** calendar ***
 no changes

 calendar: started
 calendar: received 16
 calendar: sent 1

see kontact-2014-01-15-18-30_syncevolution-log.html