As popatim has pointed out, the clone is (generally) a precise copy of the "source" drive that's being cloned.
Naturally you understand that if you clone garbage, garbage is what you get. However, there are some disk-cloning programs that will balk at cloning the data from a defective drive. It will depend upon the degree of the problems. But most will clone the data contents of the drive regardless of data corruption or disk "sector" issues.
In any event you probably should attempt a disk-cloning operation. There's really little - if anything - to lose and since your drive may fail with the loss of data you should have a backup if it can be managed at this point-in-time.
But, of course, you're avoiding the real problem, aren't you...