Bad sectors are risks. A bad sector is a specific portion of storage space on your hard drive that has become corrupted/unreadable and no longer allows you to read or write data to that section. Having a single bad sector or even a few bad sectors does not normally render your hard drive unusable, but over time, erroneous sectors tend to multiply and the more of them you have, the more problems you'll have in accessing data from your drive. Cloning and recovering form that clone is your best bet earlier on as it increases your chances of data recovery with less stress on the drive. Preventative support over reactive support wins every time.