What fileformat for backup, and not get Corrupted files...

What fileformat is the best for backup and not get corrupted files over time?

After seen:

I found out that Eric Cheng in this movie said that after time the data get corrupted. I'm starting to get many pictures in my backup and I can't afford to lose any of them.

Perhaps Eric Cheng or any other can describe how to sett up a backup system that dos not get corrupted files over time?

I'm using Mac with Lightroom.