Reduce Load On Your PC- Transfer Data From One PC To Anoter

Hi. These days my laptop is working slowly. And guess it is probably due to the amount of files stored on it. The memory is not empty and probably that is why it is taking so much of time in processing. I was thinking of transferring all the extra and not so useful files to the PC. So can you please suggest me fast ways of getting a data backup and best way to transfer data from one computer to another. Thanks in advance.
