You should make sure that you store your Will safely and tell your executor and family where you have stored it. If your family and executor cannot find your Will, then your wishes may be ignored. They may even find an earlier Will which had been revoked but not destroyed. This can also be problematic if you have never made a Will before, as this could cause your estate to be divided under intestacy law. Many people store a copy of their Will with either their solicitor or their bank.
This is because these are both institutions that are generally trusted to hold documents safely on your behalf, usually in a manner which is safe from disasters such as a fire.