Microsoft’s Windows 10 has been available for downloading since July 29th. For owners of Windows 7, 8 and 8.1 it’s a free upgrade, at least for a year, so there is no rush to install it. The consensus among reviewers is that it’s going to be excellent, but wait until the bugs are fixed. Windows 10 combines the best features of Windows 7, 8 and 8.1.
Mac’s current operating system, Yosemite OS X (not shown) works very well. The next release is El Capitan, is rumored to be coming in the fall. Since El Capitan is a popular feature within Yosemite National Park, it is generally considered that the new OS will be a refinement of Apple’s Yosemite, just as Mountain Lion was a refinement of Lion, and before that Snow Leopard fixed the problems in Leopard.
A good rule of thumb is to wait until the first update of a new operating system is released before installing it. That would be 10.11.1 for Mac OS X El Capitan and for Windows 10, probably Windows 10.1. Of course, you should ALWAYS do a full backup before install a new operating system. That way if anything goes terribly wrong, or doesn’t work well in the new system, you can go back to the one that did work.
For more one backups, see my blog on that subject.