World in subfolder breaks script

My `level-name` is `HSH/Home`

tar tries to create a file wich doesn't exists.

i quick fix my probleme using sed :
`WORLDTOTAR=$(echo $WORLD | sed 's/\//_/g')`
and pass new world name to tar

```
BFILE="$WORLDTOTAR.$STAMP.tar.gz"
CMD="tar -czf $FINALDIR/$BFILE $WORLD
```

Maybe this is not the best way.

This is for backup_server.sh
