how to back up contacts from oneplus one to google account how do I backup my contacts from my oneplus one to google account or make a vcf file? i have tried to sync with setting>accounts>google>contacs(sync) on my phone but it doesn't save the contacts to google account. please help.
Yiou have to move your contacts from SIM card or Phone storage to the Gmail


Go to the contacts app and in the menu ( 3 dots in top right corner ) there is Import/Export. 
Select Import from SIM.
Now mark all contacts you want to move, there is button to Select all
Click Ok and select to move them to Google account
Now wait till it sync your contacts into Gmail, they will be visible at Google contacts