If you are using a page tagging web analytics solution you must be aware that your information is being (in the most of cases) saved in a third party database, ergo if anything happen with your service provider or you just want to change it you will lose your historic information.
Your historic information is all what you’ve got to plan your future action, so losing it will leave you almost blind.
So one way for avoiding this risk is just implementing another web analytics tool in parallel. I mean, I’m not talking about training you and your team for being able to use both or spend the double of time analyzing the same thing, just have the information if the need arise, just because…
If you go this way please consider that if you want two different tools measuring in a similar way, you will probably need to I pekoe t them in a very different way.