Don't Install Marshmallow If You Haven't Prepared
Android Marshmallow is an impressive update that comes with a ton of changes. The update has a chance to make a noticable impact on your Nexus phone or tablet. There's no guarantee that impact will be positive though.
Major Android updates can cause major problems on Nexus devices. We saw with Lollipop and KitKat and we're already hearing about Marshmallow problems. You're going to want to be very careful with it and we recommend some prep work before you install.
We've put together a list of steps to take before installing the Marshmallow update. We've also put together some upgrade tips. Some of you might be able to get this done in a few hours. For others, it's going to be a lengthy process. Take your time.
If you're prepared and you're patient, you're going to come out of the Android 6.0 release much better off. Don't rush into this update.