transfer photos from computer to Cruzer flash drive?

Does anyone know of a way to add only NEW pictures to a flash drive, when you don’t know exactly which folders they’re in or how many there are? Maybe a way of comparing what is currently on the drive with what’s currently on the computer?

Or is the only option to resave the entire My Pictures folder?

I guess it doesn’t take too much time to cut and paste, or drag & drop pictures. It’s not like doing an entire backup of files. But does it wear out the flash drive to keep resaving everything. I wonder if I can do a search for ‘date modified’ and find them that way, hmmm…I may have just answered my own question.