nmdb databases are ordinary Windows files and so they do not need any special treatment when copying them or backing them up. For this reason, NoiseMap does not have a special function for backing up standalone (nmdb) databases.
Just make copies using the ordinary copy and paste commands in Windows Explorer.
It is essential to make backup copies regularly and frequently, for example at the end of each day's work, or before making major changes to a model, just in case a system error, computer crash or other problem corrupts the database.
