Claudia,

if you try to save it in the same location and the same name, the system
should warn you that the file already exists, and ask you if you want to
replace it. As long as you're satisfied that the copied file is behaving as
you want, and has all the data you want, you could safely say yes. But you
may want to hang onto that original just in case there's something missing.
If the original name is important, you could rename the original file that
became protected, and then save your newly copied file as the original
filename.

Jim