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Accounts & sync11.6
Use the Accounts & Sync settings to add, remove, and manage your Google
and other supported accounts. You also use these settings to control how
and whether all applications send, receive, and synchronize data on their
own schedules, and whether all applications can synchronize user data
automatically.
Gmail, Google Calendar, and other applications may also have their own
settings to control how they synchronize data; see the sections on those
applications for details.
General synchronization settings11.6.1
Background data
Mark the check box to permit applications to synchronize data in the
background, whether or not you are actively working in them. Unmarking
this setting can save battery power and lowers (but does not eliminate)
data use.
Auto-sync
Mark the check box to permit applications to synchronize data on their
own schedule. If you unmark this setting, you must touch an account in the
list on this screen, press Menu key, and touch Sync now to synchronize
data for that account.
Synchronizing data automatically is disabled if Background data is
unchecked. In that case, the Auto-sync checkbox is dimmed.