[q] problem of contacts getting deleted

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http://forum.xda-developers.com – hello guys so i rooted my sensation like 6-7 months ago and in the beggining i used to use sense roms but then i switched to cynogen mod ...so the main problem here what im talkin about is that when i flash a cyanogen mod rom and den store contacts and when i flash an update or any other stock rom the contacts that i had saved erases . i never used to face this problem when i was on sense roms ... now everytime i flash an update of a stock rom i have to restore (like by writing each of them) all the contacts . can any1 help me with this plzzz (HowTos)