When the HTC One was launched with US mobile carrier AT&T, the HTC Backup App was not available for the device, it has now been launched and is available to download from the Google Play Store.
The HTC Backup app will let you backup your data on your HTC One handset, and it comes with support for more that 150 settings, the app is powered by Dropbox.
HTC Backup is the simplest and most complete way to protect and preserve the unique HTC One experience you create for yourself. HTC Backup saves your phone’s apps and settings to the cloud. When you reset, replace or upgrade your phone, you will be able to quickly recover your apps and settings.
Your HTC One is backed up automatically once per day when connected to a Wi-Fi network. You can also backup your phone manually at any time over a Wi-Fi or mobile data network.
You can find out more details about the HTC Backup app for the HTC One on AT&T over at Google Play, the app is available as a free download.
Source Android Community