you can use the tar command on the tape to view the images directly from the tape. make sure you're using netbackup's tar (which tar) and then tar -tvf /dev/rmt/0cbn to read the tape. the t option means traverse, v is verbose, f specifies the file to read (in this case the tape which is /dev/rmt/0), c for compress, b for no sure and n is norewind, so you can leave the tape at the last position, ready for the next tar. when you're happy that you can read, cd into the restore dir, and use xvf to extract, instaed of tvf. the first tar command will give an error as its the tape header and not a tar file.
oh - i hope you're on a unix server as not sure how all this works on m$.