Restore from AutoFTP backup fail in SolusVM: /usr/local/solusvm/tmp/ftpbackuprestore.pid already exists

Symptoms 

Restore from AutoFTP backup fail:

CONFIG_TEXT: Checking connectivity to FTP backup server...
/usr/local/solusvm/tmp/ftpbackuprestore.pid already exists. Is another restore already running?
exiting...

Cause

There is a PID file of the previous restore process.

Resolution

1. Connect to the corresponding node via SSH
2. Remove PID file:

   # rm -f /usr/local/solusvm/tmp/ftpbackuprestore.pid