how to create a back up?

Hi ms4 thank you for your post. 

To process a backup file, the first thing that we have to check is the program that you are using.
Are using an MYOB Business? If yes, the option to do a backup is not possible as the file is stored online already and you can access it as long as you have an internet connection.
If you are using AccountRight software, you can check this Help Article to process a backup: Backup your company file

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Regards,

Hannah