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I think that the most important files to back up are your “Documents” and “Pictures.” If you have stored them in the above folders they will be easy to transfer to your external medium.
The new WD (Western Digital) external drives have installed software that will allow you to back up just the files you want and they will also perform incremental back ups when you create new files. You can add a password to protect your data should you lose your external drive. The drive will only “unlock” if the correct password is entered so make sure that you use upper and lower case letters and numbers or symbols to make the password more secure.
The WD Passport Portable External drives are small in physical size and convenient to carry; they also come in several colours. The recent units have 500GB – 750GB and 1TB of storage space. Some are sold with a matching case.
Keeping a back up of your important files will be a safeguard if your computer malfunctions and it is also handy for transporting your files when you travel or wish to move them to another computer.