I'd tried several ways but my backup job still failed and get the below mesaage:
"The media provided to continue the backup already contains data from one or more sets created during this operation.
The operation can not be continued."
So I decided to empty up my tape in order to re-backup a fresh data into it. I do not have the choice neither "long erase" nor "format" in veritas. They are grayed out. What should I do ? URGENT !