Nowadays, security is a top priority for almost everyone, especially businesses. Running your own services, or storing data but still being able to get to it all while away from your network is a common question.
How to get to my data safely over the Internet?
There are ways that you can get to your data while you are away from your local network by publishing the services over revers proxy for example. The "problem" there is that you have to harden those services as best as possible or limit access if you want to increase security. Also, you have to allow access to those resources on your router in order to be able to access them in the first place, and that means, you are not the only one that can do that.
But what about when you have multiple locations that you want to have secure, remote access to but still have them configured in such a manner that the apps and services (including devices) are not exposed to the rest of the world?
Enter site-to-site VPN. Now let's be clear, this is nothing groundbreaking new even in the Synology world, but it is also not so common unless you actually need it.