I'm using a mid-2012 rMBP running El Capitan, with a NetGear R6300 router and a WD MyCloud 2 TB NAS for backups. I have been unable to get a Time Machine backup done since the day I installed El Capitan. I've tried, and tried, and it always got stuck on some low level number of bytes backed up. I tried a suggestion in the WD forums to get it to work, which was to do a System Restore of the WD settings and set up the backup disk again. That seemed to work, and the Time Machine backup was proceeding along at a normal pace. Until I saw this in the console: 11/8/15 6:07:56.127 PM com.apple.cts com.apple.revisiond.requeue_chunking: scheduler_evaluate_activity told me to run this job; however, but the start time isn't for 7200 seconds. Ignoring. Then, Time Machine counted down. All 7200 seconds worth, until every last one of those seconds expired. And gave error log entries all along the way. If you do the math, that comes out to be a neat 120 minutes. Or, 2 hours. Totally, absolutely wasted time, all because of some kind of an interface bug where Time Machine evidently failed to send a correct parameter to one internal routine or another. 2 full hours. Wasted. On top of the 7 hours that this thing has been running already. On top of the 3 hours it's been "cleaning up". Which is still running. And running. And running. I don't know OSX internals or Time Machine internals. But I do know a hell of a lot about computing, and enterprise backup and restore in particular. And I've never seen anything like this before. My opinion is that Time Machine is an incredibly poorly implemented app. Truly awful. And yet, before El Capitan, it worked pretty well. Not flawlessly, but OK. To the point where it was usable and effective. But not any longer. Apple should be ashamed of this. Given the debacles with IOS8 and 9, I figured El Capitan would be good. But, silly me, why should this be any different than any other Apple software? Apple's quality control is not just bad. It's awful, to the point of being embarrassing and frankly unprofessional. What the hell has happened to Apple in recent years?