I have used Control Panel to move the backup files (three files .jpa, .j01 and .j02) across to the test3 folder - so no downloads or uploads.
Running test3.mydomain/kickstart.php starts normally and I did not change default settings. The extraction seems slow until it reaches about 20% across the bar and then seems to freeze - have watched for more than an hour.
I have attached backup log for the backup being used.
I did have earlier issues with getting kickstart to start but that was resolved as an issue with the AdminTools generated htaccess file on the live site carrying over to the subdomain (as yet without its own htaccess file). I commented out the relevant htaccess code temporarily and kickstart started OK..