Are you requiring the single user (desktop edition) or the multiple users (cloud or server editions)
To access single user Manager on different computers you must keep them all updated to the same edition. Then if you use a service like Dropbox, you can store the data files there and they will sync each time you start up assuming you have an internet connection. Read below
Without an internet connection you will need to do back ups on to an external storage device and then do a business restore each time you use a different computer