Can jailbreaking your iphone 5 ruin the phone?

My dad is going to jailbreak my iphone 5! But this will be my dad's first time jail breaking an iPhone. Could this ruin my phone? Like break it? How can we prevent this from happening? Also, i don't want my photos, music, contacts, etc to be lost so how do I back that up?!

No it can't

YES, it is risky, most of the time things go well, but If something goes wrong, you voided your warranty and can't ask apple for help.

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