That should be the location of the backup of the database. It is unlikely to be a problem with the deivce. It is probably something with the destination. Does the path exist? If not, you need to create it. And do you have permissions to write there?
Also, that does not look like the full error message. When you click the details button, it should show a traceback and other details. They are there to help debug problems like this as the traceback tells me exactly where the problem is in the code. Please post the full message by clicking the copy button and then pasting that from the clipboard.
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