Hello folks 
I have many Variables that are in sync between my Machines and even my VM‘s …
They are all stored in a Subfolder called Synced Global KMVAR‘s inside of my Pseudo Package File in my Dropbox where I store all my KM related Data.
Some of them are quite heavy because of Base64 encoded Image Data, some are large JSON Files (up to 6 nodes deep nested.
Even if KM could probably handle some of them - I have them stored there for easy access with any Text Editor if I need to have access.
Whenever the contents of these Variables are needed I recreate the Variables on the fly just before the Macros which need access to them are called.
I hope this gives you an idea of how I handle some of my Variables.
Greetings from Germany 
Tobias