There's open source software to do all of that, and it is relatively simple to setup. However, you will soon find that the real nightmare is in maintaining all

There's open source software to do all of that, and it is relatively simple to setup. However, you will soon find that the real nightmare is in maintaining all the services. With paid for, or google hosted, services you set it and forget it. It's also much more expensive to roll your own. That said there is a nerd-cred factor that had me set up owncloud on my personal domain. It's definitely a nuisance though hosting your own stuff.