How to backup my apps on my iphone 4s before downgrading?

I'm looking to downgrade iOS 6.1.3 to iOS 6.1.2 on my iphone 4s by downloading the 6.1.2 ipsw file, so I can jailbreak. However I don't want to lose any of my apps or app data. I want to know: 1) Is that kind of downgrading even possible? 2) How can you backup your apps and app data, and restore them when you're done without going back to 6.1.3?

You can use iCloud to backup your phone apps setting. You have to download apps again if you loose, but you can retrieve setting from iCloud again for all apps.

You wouldn't be able to downgrade anyway. You'd need SHSH blobs. Its not as simple as downloading the firmware & going through iTunes.

iTunes does the backups/restores

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