Using a worksharing environment allows you to work directly on your workstation’s hard drive. Although working off a network file is typically a good idea, there are several reasons why a local copy offers additional benefits:
It allows more than one user to make changes to the central file by editing local files and synchronizing those changes with the central file.
Your local copy will be more responsive than a networked local file because your access speed to your hard drive is much faster than it is across most networks.
If anything bad happens to your network or your central file, such as file corruption, each local file is basically a backup that can be used to create a new local file by performing a Save As operation and selecting the option to make this a new central file.