Like the other responder said just keep the JPG's and then when you edit and
image then save it to TIF or PSD. It is after you edit and then need to
resave the image that you want to move away from JPG because if you edit and
then just do save you are basically doubling the data loss from the JPG
compression.
I also recommend that you keep your JPGs because some programs will strip
out the EXIF data and that data is important. Some programs can use the data
to help fix the images. So if you always have your JPGs you will always have
the information. Photoshop shouldn't strip this data out, most good programs
shouldn't but one never knows. If you use Save for Web in Photoshop to save
a JPG the data along with other things will be stripped out.
R
>> Stay informed about: JPEG to TIFF