1)Log into the mydata portal 

2)Go to Download in the left side Navigation Pane.

3)Click Download Now under Mac

4)Once the Download Completes run the Drag the backup Client to the Applications in the installer.

5)Follow the steps in the installer and complete the install.

6)Once the Install is completed you will be prompted to enter your accounts username and password.

7)Once you have entered your username and password click finish. 

8)Once finished and the system has authenticated you will be logged into the mydata portal where can now configure your backups.