How to backup on Proxmox?

root@proxmox:/var/log# vzdump 161 --quiet 1--mode snapshot --mailto myCorrectEmailAddress@domain.com --compress lzo -storage local
400 unable to parse boolean option
vzdump {<vmid>} [OPTIONS]

Yes, I tried with nano /var/log/syslog, but file has code in it.
 
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root@proxmox:/var/log# vzdump 161 --quiet 1 --mode snapshot --mailto myCorrectEmailAddress@domain.com --compress lzo --storage local
Cursor blinks slowly for about 5 seconds, then returns to
root@proxmox:/var/log#

I then checked /var/log/syslog, but still no data in the syslog file.