This is an actual Windows function and really should not need explanation as it is basic use of Windows and has nothing to do with any specific program. It is the same for any data file be it a Word Document, a spreadsheet or a payroll company database.
Using the Windows File Explorer (Stop here if you do not know what the Windows File Explorer is and see about getting into a basic Windows class at the local College or High School Continuing Education facility.) navigate to the "My Documents\PayWindow Data Files" folder. Then Right Click on the database that you want to copy and give a new name to. In our example, the database is "ZPAY Payroll Systems Inc 2010" and when we right clicked, the popup menu gives us choices. We will select Copy while will copy the file to the clipboard.
Next Right Click into the free white space under the files listed and select Paste from the popup menu.
That will paste the file in and if you then click on the file name and wait a second and click again, it will highlight the file name allowing you to rename it.
In our example we renamed it to be the same name with the exception of the year which we changed as you can see.
Then in PayWindow to use the new file we need to open it. So click on File and select Open Company from the drop menu.
Select the file to open, and in our case it is the copy we renamed for 2011 and click Open.
It is that easy, if you know how to use Windows.