This method you can copy your call center data to a new machine.
SSH to the production machine
This command makes a copy of the database to the local file directory
mysqldump -p call_center > call_center_backup.sql
this backup the file to the local folder. WINSCP is a great windows application
move this backup .SQL file to the destination ISSABEL machine
SSH to the new machine you want to apply the backup
this command will upload the file INTO mysql/mariaDB
mysql -p call_center < call_center_backup.sql
You should pretty much be instantly able to view everything.
The same thing should work for the vtiger521 database as well