I would recommend backing up all your original photos to a cdr or cdrw first
as they
are. Once you resize them, you lose the quality of the image if you try to
make them bigger again later.You can also save them in a compressed jpg
format to keep the image size the same but save some disk space. You will
still suffer some image quality loss however. Remember, once you lose the
original image, you can't get it back, so I never work with my originals.

Always with a copy of the original..Then you can always start over if
something goes terribly wrong.

Ken