Smartware question

I am interested in the Western Digital My Book Essential 2TB USB 3.0 Desktop External Hard Drive. I have read that the software included in this drive, WD Smartware, will back up my computer automatically. However, if I delete a file on my computer will that file also be deleted on the external hard drive? I want something that will archive files.

Thanks in advance for any help.

No files will be deleted from the drive since it’s a backup not a sync software. 

If you’re looking for software to synchronize the drive ( whatever you delete to be deleted from drive as well) then search online,  there’s plenty of options available.