Personally I use SuperDuper, don't use Time Machine, not reliable enough for my liking as a full drive restore solution. Truthfully there is absolutely no imperative to upgrade primary systems at the .0 OS release, I even know some who deliberately remain a full cycle behind, and in some respects this makes good sense, as when they do upgrade the OS is extremely solid, they still get the benefit of a major upgrade to OS X, with significantly reduced chance of issue.
All too often it`s easy to buy the hype and push the button to upgrade, what one should really do is consider the pro`s and con`s first, moving from 10.10 to 10.11 will not be a revolutionary experience, especially if the current 10.10.5 has no issues. By the time 10.11.2/.3 is released the majority of the major issues will have been resolved
Q-6