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Backups normally have miscellaneous settings and code from previous OS versions. It can cause kernel panics and miscellaneous problems. For most users, this won't be an issue but after enough usage and OS versions, there will be a lot of data left in the system that is classified as miscellaneous and can cause problems. iCloud backups seem to be a little better than iTunes backups. If you're looking for flawless performance from a new device, the best practice is a clean install. If you care more about saving time with apps and data, restore from backup. If you then run into issues, do a clean install.
 
If you're really worried about this type of thing, just restore from an iCloud backup. As far as I know, a backup in iTunes stores EVERY SINGLE THING on the phone. An iCloud backup only stores things like contacts and pictures.

That's not correct. iCloud backups can also contain app data – although you do have the option of configuring which of your apps will partake. I store many personal videos in an app's data, for example, but I have no need for them to be included in the iCloud backup so I turn the backup option off for that app.
 
When I got my phone yesterday I restored it from backup and here we are, blutooth was not working well today, while screen was locked I can't skip my songs playing them with bluetooth streaming in my car. Same happened if I pressed manually next button. Nothing helped in settings and I stopped by apple store to verify what to do. After resetting everything phone is back to normal, so don't waste your time and go with fresh install and settings. It reminds me Windows issues very much :)

Kinda like the Geico commercials.... every one knows that.
 
I will be selling my ipad 4 shortly.

It is currently on 6.1.3

I would like to advertise that its on 6.1.3 to possibly attract more buyers.

If I "Erase all Content and Settings" - will it automatically install the latest 7.0.2 ios software?


Or will it stay on 6.1.3?

Thanks!
 
I've restored every one of my iDevices from the previous one's back up, all the way back to my 1G iPod touch. I plan on going clean with my 5S though, whenever I get it.
 
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