HTC One M9 User Manual page 217

Power and storage management 217
Remove unused themes
Themes can quickly consume up storage space because themes can include images,
sounds and icons. Remove themes you're not using. See Deleting a theme on page 94.
Back up data and files
Keep only the most recent data in your apps and files that you often need to use. You
can back up your other data and files. For some tips, see Ways of backing up files, data,
and settings on page 223.
Remove or disable apps
Uninstall apps that you've downloaded if no longer need them. Preinstalled apps can be
disabled when you're not using them. See Disabling an app on page 316.
Move apps to the storage card
Third-party apps that you've downloaded and installed can be moved to the storage
card if you've set up the card as internal storage. See Moving apps and data between the
phone storage and storage card on page 213 and Moving an app to the storage card on
page 214.