Its always good to backup your contacts in a different location. You can sync your Nokia N97 contacts with Google contacts. By using Sync, you can have access to your address book at anytime and place that you need it. Your contacts stay synchronized whether you access them from your phone or from your computer.Add or edit contact information right on your device or on your Google account on the web.Simple steps enables this feature on your Nokia N97.
Screenshots below explains you better to setup sync your mobile contacts with google contacts. Follow the following steps.
Settings
Data Transfer

Page 3 : Select only Contacts in "Applications in sync", remove other checkmarks in that list. -> Next

Your contacts will be synchronized with Google Contacts















Thanks it was useful
November 1, 2009 4:04 AMCan one do syncing of notes, todo also the same way? Doesn't google support others?
November 1, 2009 4:06 AMExcellent, that was clear and worked first time, unlike the various opaque instructions in Google Help and on the Nokia site which had me scratching my head and swearing at the cat!
November 7, 2009 4:13 AMIt didn't work for me.
November 10, 2010 9:34 AMIt only said: Invalid host address... :(
I worked it for me.Thanks much!
December 19, 2010 7:36 PMyea, it says 'Invalid host address' :(
March 25, 2011 8:22 PMFor those who got invalid host address, watch out for the "s" on "https". It surely will work !!!
April 12, 2011 2:22 AMthanxs it works for me
April 17, 2011 6:33 AMfor invalid host address use https instead of http
thanks !
June 24, 2011 3:59 AMEven with https, it still gives the "Invalid host address" error.
August 18, 2011 6:01 PMThere was also a setting on my N97 "remote contacts database", I just called it Google.