HTC One M8 User Manual page 236

236 Sync, backup, and reset
2. Tap Import/Export contacts > Import from phone storage or
Import from SD card.
3. If you have more than one account set up, tap the type for the
imported contacts.
4. If you have multiple backups available, select the backup you want
to import, and then tap OK.
5. Enter the password you've set for this backup, and then tap OK.
Backing up your text messages
Keep important text messages by backing them up to the phone storage.
You can easily restore backed up text messages after you've deleted them
from your message list.
1. Open the Messages app.
2. Tap > Back up/Restore SMS > Back up > Back up SMS.
3. To help protect your data, set a password for your backup. Be sure
to remember this password. You'll need to enter it again when
restoring messages.
If you don't need a password, select Do not password protect this
backup.
4. Enter a name for your backup file, and then tap OK.