No worries, we are here to learn
The command my partner shared with you have to be executed from the computer you want to have the backup file.
As I don't know exactly which platform you are using in the computer you want to download the backup (Windows, Linux) I would recommend you to follow this Bitnami guide about downloading/uploading content to your server using an application like Filezilla or WinSCP.
Could you give a try to that guide? If you don't understand clearly something I will be more than glad to help you.
I hope this information is useful for you.
Thank you and best regards,
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