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Gmail app; how does the 'sync' features work?

Curious Mew

Newbie
Hi all, I've been wondering how the synchronization features work in the Gmail app?

What is considered a good setting for mail/labels? 'Sync none', 'Sync all', or 'Sync last # days'? How many days should I choose? No matter which options I set them to, I can't seem to tell a difference in my mail?

I like having all my mail with me, but I have lots of labels (most of them are full of spam). I'm afraid the massive syncing could be draining the battery life on my phone? Can someone help describe the sync features to me?

Thanks :p
 
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