[1.7.10] fml confirm backup failure

[geech6]

We updated our server's pack, got some missing mod id's apparently, and now every time I do /fml confirm in console the server reboots and it says in console only that the crash wasn't parsed to the log file and the backup failed.  Is there a way to disable the backup that forge tries to create after typing /fml confirm.

[luacs1998]

Run your server with -Dfml.doNotBackup=true