Syncing current phone contacts w/ Google

I want to restore my phone back to factory defaults, but my google contacts are not current with what is in my phone, so I am hesitant in continuing, less I suffer the loss of them. How can I sync the two, so when I restore my phone it will get all of my contacts back?

Take a look at this document

Sync My Google Account

Once you complete the sync.

You can go to

contacts.google.com

and make sure all your latest contacts have made it online before you proceed to factory reset.

You will need to use Photos app to sync your Photos and Videos

You will need a third party app such as

to backup your SMS messages.

SMS Backup & Restore - Android Apps on Google Play

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