Why when clients delete files mapped to server they don’t go to recycle bin

Could you explain why, and also, i have a terastation that is a raid 5, deleted files goes to the terastation’s recycle bin!. Is there something i can setup on the server to act like a terastation so they won’t delete? Or is there something i can do to prevent that. I would think that microsoft would do something about accidental deletion, which i’m sure happens all the time around the world.

Also again :-D, if i make client’s part of the domain, they still store their files locally unless i create a roaming profile, but if i don’t, and they are mapped, will they still be deleted?

Thanks