Apple desktop OS, OS X upgrade, unlike Windows, no need to re-format. I had upgraded my Mac from Tiger to Leopard and Snow Leopard, all without re-format and there is no drop in performance (such as getting slower over time).
Backup to iOS, the only thing I don't like about iOS upgrade is the backup! The backup takes very long, nearly 1 hour for me. And I couldn't skip this step. And if I accidentally kick the USB cable, the backup sync will be drop and I will have to re-do everything. So, for this upgrade, I just left it there, don't touch it.
Now happy with my new iOS :)
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