Serverbackup/ Webbackup = empty backup.php

1. When i start Tools/Backup in ISPConfig, i get only an empty backup.php to download... I don't know why, it worked last week without a problem...
How can i fix that problem?

2. How can I create the backup via hands?
With this backup it should be possible to copy all ISPC-Settings, Accounts and Webs from one Server to another. (Do I need all Apache Configs?)

Code:

#!/bin/bash
# untested

$backuppath=$1

cp /var/www ${backuppath}
cp /etc/apache2/vhosts ${backuppath}

 

Yes.... it is possible that the backup is too big