Backup zip files

I ran back up, created the zip file (some 23+MB).

When I try to use winzip to open it it says it is not a valid zip file. I've tried with both winzip 9 and 10.

I'm using 3.2 build 3201

Also, I don not see a restore option in the VO - I see back up but not restore - is the normal way to 'restore' to just unzip the back up file?

Like I say, this does not work. What am I doing wrong?

Steve