There is nothing to worry on the present state of your HDD.
If there is any mention of bad sectors, then you need to regularly see if the number of bad sectors are increasing continuously or the numbers of bad sectors has stabilized at some point.
I have a lot of bad sectors on my HDD and only able to use 39% of my HDD because of that and even after 2 years, i am still using the same HDD .
But having a full back will always help, even if the HDD fails prematurely.