You can do a manual back from 4D Client or 4D Runtime Interpreter (The engine that runs CurrencyXchanger in standalone mode).
Make sure that no one is using the system before doing a backup. Also, you need to make sure that all windows are closed before doing a backup. In a client/server environment all clients will freeze until the backup is over. Depending on the size of the data file, the backup may take from a few seconds to a few minutes. Please refer to the previous section on how to setup automatic backups everyday.