deepin-clone: exclude function?

is there have ```exclude``` function?

### why need?
* my ```/dev/sdb3``` mounted at ```/userdata```
* this disk neednt backup

### bug?
* cant set backup location at ```/userdata```
* all of ```/userdata``` will be backuped when do a full system backup

system: uos v20 1011    
deepin-clone 5.0.3

thanks!