You really should be using
version control, although since you are using Labview, you won't be able to effectively merge code if 2+ programmers want to change the code simultaneously. You can use
Github to set up an online repository (otherwise it isn't very difficult to set up a local git or svn server and there are tons of guides to walk you through the process). This is a very robust way of storing and accessing your code and will also let you easily revert back to previous versions.