The Mac minis have proven very reliable with a long life as a server. There are ways to upgrade a Mac mini. We have them available to rent or you can send in your own.
Some people get hesitant to have their machine out of their reach. Don't be nervous. We've been doing this for a long time. When you need some help, we're fast, experienced, and quick to respond. We've seen just about everything.
When you're done hosting, we'll get your Mac mini sent back to you or help you resell it here. The machines keep their value really well. Many people will host for a few years and then sell their Mac minis and get most of their money back on the resale.