Questions about HDDscan read test results

[tomi66]

I have an old external Samsung HDD, its maybe 10 years old. Recently I started to notice that copying and transferring files from it was very slow and often interrupted. I decided to run an HDDScan on it. And this is the result:
https://ibb.co/dvsnto

Correct me if I´m wrong but I´m pretty sure this HDD is almost dead. I will try to save the files that are on it. My question is I ran windows disk check and it said that the disk is alright and healthy? How is that possible? And with how many bad sectors can an HDD live with? At what number should I replace it?

 

[seagate_surfer]

tomi66, read this informative article on bad sectors. You should have a backup in place at all times as a drive can fail at any given time.

The conventional wisdom by tech experts on backups is known as the 3-2-1 method.

Basically you want:

3 copies of any data you don't want to lose
2 different mediums it's stored on.
1 copy kept offsite, to prevent against disaster.