What Atribute Names on CrystalDiskInfo mean, and which should I be concerned of? [duplicate]

Recently, I checked CrystalDiskInfo on my HDD, which I use to store videos, files, and image files on my PC. The Health Status is shown as Caution. What does Caution really mean?

After checking CrystalDiskInfo, I was wondering what each of the attribute names means, what each of the numbers really means, and how soon I should back it up. It’s quite old now (over 6 years), and I was planning on backing up the data to a new HDD.

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Also, how should I back up the data? Should I just copy & paste the folders to the new drive, or should I clone the drive with something like Disk Genius or Clonezilla?