I have a number value in my server, and I want to save that value so that when players join new servers the value does not reset from what it's been at since previous servers. e.g If the value goes up by 1 every second, and it reaches 100, when a new server is created can I make it start at 100?
It's possible, but you should really write something yourself first give it a shot and if you mess up we can help.
Here's a helpful data store guide http://robloxdev.com/articles/Data-store I believe they even have a very useful guide of exactly what you're looking for.