Actually I also agree with the previous commenter. All features are in default settings already. But if you insist WhatsApp might be the answer. Because it always backs up its data. There is modified versions of WhatsApp also available now in Cydia. Try some online jailbreak methods like http://www.cydiaguru.com to download Cydia without jailbreak. And who knows.. you may find some tweaks for something like this also.