There are many possible reasons that may relate to your device being unable to backup information. Please follow the next guide in order to map your WD My Book Live and create a network link, and then proceed to initiate an Apple Time Machine backup:
http://wdc.custhelp.com/app/answers/detail/a_id/2686/
Please note the default name will be “mybooklive”. As an alternative, instead of using SMB you can use the AFP protocol (Same procedure) as it is optimized for Apple Mac OX systems.
It is actually a very wise decision to ensure you have at least 2 (Two) active backups working separately. The more redundancy, the more protection you are ensuring in case of a data loss emergency.
