How to Delete and Restore Photos from External HD?

I want to permanently delete certain photos.  I have deleted all copies from the PC.  Will my next back up “over ride” the photos on the external HD to remove these photos or do I need to remove the photos from the external HD?  If I need to delete the photos from the external HD how do I do that? 

If I wanted to restore some of those photos from the external HD back to the PC how do I do that?

I am a complete novice at this.   Thanks in advance for any and all advice! 

If you where using smartware then no, it will not delete anything that you delete from your computer. You need to go manually into the smartware.swstor folder and delete the photos manually. To retrieve the files follow the link below, or just copy and paste the photos back to the computer.

http://wdc.custhelp.com/app/answers/detail/a_id/3829/session/L3RpbWUvMTMzODE1NDk5OC9zaWQvTmt5LXdiWms%3D