How to backup contacts and sms messages from Sony Xperia SP LTE (C5306)

Losing your contacts can be frustrating. This guide shows you how to use PhoneCopy.com to keep a safe backup of all data from your Sony Xperia SP LTE (C5306) — it only takes a few minutes.
Download PhoneCopy for Android to your Android phone, which you can download free of charge. After downloading and installation, go through following steps.
Backup contacts and SMS from your Android
Run the app and create new account. You can check which contact databases you want to backup and synchronize. You can do multiple choice.
After successful login, press "Advanced & Account". Select "One-way sync" and after choose "This device >> server".
Contacts from your Android phone will be copied to PhoneCopy.com server in few seconds.
With your contacts safely backed up, you can rest easy knowing your data is secure. Log into your PhoneCopy account at any time to view, edit, or restore your contacts.
Some additional tips:
If the sync does not complete, make sure your phone has a stable internet connection and that background data is enabled for the PhoneCopy app. A brief pause and retry usually resolves the issue.