Sign only one copy. A change in marital status,birth of a child or a move to a new state. You can do this by amending it by way of codicil or by drawing up a new one. If you choose to make up a new one, make sure you sign it. If you name a trust company, it will hold your Will in safekeeping.
Some states seal safe deposit boxes upon death.
This may not be the safest place to keep your Will. If your attorney prepared your Will, have him or her retain a copy with instructions where the original can be found. Or make sure a friend or family member know where to find a copy. If your state recognizes power of attorney, appoint someone to act in accordance to your living will. Making sure you've done all you can should give you peace of mind.