Time Machine and Yosomite

Since running the Final Version of Yosomite i have not been able to get a backup to run WD MY Book Live 3TB.  I starts be never gets more than 15-20 GB done and that takes about 12 hours.  I have tried to do it over the wireless and connencted right to the ethernet.  It is slow on either connection.  Other things i have tried rebooted the drive, laptop and recreated the Time Machine share.  Last time there was a firmware upgrade that resolved this problem not sure if another one is coming out for Yosomite.

Is there an apostrophe in your Mac’s name? If so, removing it might be able to to help.

Regards,