If I use Forge is there a way to revert back to vanilla without breaking anything. I realize that the new mod blocks will be missing or need to be removed. Is it possible? I would like to add more functionality but i don't want to lose anything if we get tired of the mods after a week or so.

 

 

There is always an issue to move from modded to vanilla, Depending on what you have, or what you've used it could screw things up.

Your best bet if you're moving from modded to vanilla is to go through and manually delete all moded items from the map.

Sadly you can't do it cleanly in vanilla because vanilla has almost no NPE protection which is what happens when there are 'missing' items.

Thank you sir.