How to backup sharepoint on SBS 2003

I am trying to backup my sharepoint site on mt sbs 2003 server. We use an online backup service (mozy pro) so I presume that I use stsadm to create a backup first then I tell mozy to backup this file.

I am using the script below, but I am getting the error "missing operation name or the operation is invalid"


What am I doing wrong. I am a newbiw with any kind of script.

Thanks

echo off
"C:\Program Files\Common Files\Microsoft Shared\web server extensions\60\BIN\stsadm.exe" -0 backup -url http://companyweb -filename backup.dat

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