Because a computer provides a large amount of space which data can be stored on like documents etc. All documents should be backed up because if the hard drive fails, it will lose all data including the documents.
It is not important for computer users to back up their data and documents.
no it can not save documents because the mouse can help you choose different things on your computer
to save documents
shared documents folder
some do
in a folder under My Documents
on your main drive C: Usually under Documents & Settings or Users if your in Vista
C:\Users\{username}\Documents\Electronic Arts\The Sims 3\Screenshots
You can save any attachment to your computer. You will need Microsoft Access to actually open it.
C:\Users\{username}\Documents\Electronic Arts\The Sims 3\Screenshots
Files.
That really depends on how much content you have on the computer.