Google Galaxy Nexus Android mobile technology platform 4.0 Users Guide - Manual (Page 97)

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Configure general sync settings
1 Go to Settings > Personal > Accounts & sync.
indicates that some or all of an account's information is configured to sync automatically.
indicates that none of an account's information is configured to sync automatically.
2 Check or uncheck Menu icon > Auto-sync app data to control whether changes you make to
information on your device or on the web are automatically synced with each other.
If you turn off Auto-sync, you need to sync manually to collect messages, email, and other recent
information, and won't receive notifications when updates occur.
For example, when this option is checked, changes that you make in your People app are automatically
made to your Google contacts on the web.
If this option is not checked, you may be able to use an application's tools to sync data manually. You can
also sync manually to collect messages, email, and other recent information. Leaving Auto-sync off can
help extend your battery life, but will prevent your from receiving notifications when updates occur.
Sync information manually
1 Go to Settings > Personal > Accounts & sync.
2 Touch the account whose data you want to sync.
3 Touch Menu icon > Sync now.