You can be able to root your phone and to do a back up to make sure that your staff are not deleted. However, when the phone is rooted, the warranty will be void even though you will have the thired party apps.
9 months ago
Last edited at 4:49AM on 3/21/2013
Jailbreaking is kind of a term for Apple products - with Android phones its called "rooting" - and yes the HTC One can be rooted. HTC recognized that people like to screw around with their phones, so the newer ones are designed to be rooted.
Google HTC ONE ROOT and there are videos, tutorials, etc. Some software is pretty easy too like z4root or super1click.