After a couple of weeks of frustration about OSX 10.9 not allowing me to use my WD MybookLive NAS for TimeMachine backups I said " Phoque it. I'll reinitialize the drive and start from scratch". (Luckily I have a full backup of this drive's non-TimeMachine content backed up on another drive). So I... * Did a factory reset of the drive. * Made sure the NAS has current firmware loaded. * Gave the WD MyBookLive NAS drive a new name * Recreated all of the users (8 users/devices) * Went into TimeMachine and pointed it to the TimeMAchine Backup folder on the NAS And Voilà! TimeMachine now works with the WD's MyBookLive NAS. Yes, it was a pain in the azz and now, in addition to having TM run a complete system backup totaling 500Gb, I need to load 1.3 TB of media onto the NAS as well and that is going to take a LONG time. The sad thing is that I had to do this in the first place. Not sure where blame lies, Apple or WD, but at least I will soon be fully backuped again. BTW....why did Apple get rid of the spinning TM icon? I liked it and so did many others.