Some personal data may be retained by the third-party app after you have
removed the account from HTC One M9.
Backup
Ways of backing up files, data, and settings
Worried that you might lose important stuff on HTC One M9? Back up HTC One M9
before you erase the storage, do a factory reset, or upgrade to a new phone.
HTC Sync Manager
Use HTC Sync Manager to import music, photos, and videos from HTC One M9 to your
computer. You can also sync locally stored contacts, calendar events, bookmarks, and
playlists between HTC One M9 and your computer.
Likewise, HTC Sync Manager is a good alternative if you don't want to back up your
accounts, settings, and other personal content to the cloud. You can use it to create
backups of HTC One M9 on your computer.
Other backup options
If you want, you can separately back up your data or files.
Some apps allow you to back up data to the phone storage or storage card so you can
easily restore them after a factory reset. Just make sure not to erase the phone storage
or storage card when you do a factory reset.
Sync, backup, and reset 219