Start menu "this pc" or "my computer"
It really depends on your type of data, if it's sensitive data or not. And it also depends on what type of backup (Incremental, Decremental, etc.). But you should aim to backup at least once a week, and also do a backup of your original backup.
Answer:
barcode reader is the correct answer
Answer: True.
Explanation: It uses only the 3 bits to represent any digit in binary and easy to convert from octal to binary and then to vice-versa. Hope that helps