Maybe we should take a step back, and look at the main problem. You want to get your backups out of the VM, correct? You can use any FTP Client (I use Filezilla) and connect to the VM using the creds :
I downloaded filezilla
Then in Host I wrote localhost
Username : frappe
Password : frappe
there is another box after Password called Port. What should I write there? I tried 8080 but it failed connection.