What are some alternatives?
When comparing X-Transfer and Backup Your Mobile, you can also consider the following products
Save contacts - Save contacts app provides features through which users can select the desired data to create the backup in a variety of different formats.
My Contacts by Captain Tushar - My Contacts is an app by Captain Tushar that comes up with features to help you in managing your contacts list so you can effortlessly delete or edit existing contacts.
Contacts VCF - Contacts VCF app enables users to import contacts to the phone’s internal storage or to other storage devices to backup them.
SMS Backup+ - Backup Android SMS, MMS and call log to Gmail / Gcal / IMAP - jberkel/sms-backup-plus
G Cloud Backup - The easiest Android Backup app that protects all your contacts, call logs messages, music, videos, family photos, and other personal (irreplaceable) data to secure, cloud-based servers for Free
Contact Backup For Android - Contact Backup For Android app enables users to send or receive files between all their smart devices without using an internet connection.