Backup is actually a 2 part process with the first part being actually creating the thing that allows you to restore it later.

The second part is what is just as important And what i've learned is that people do not go often enough, or sometimes at all, through this process. I am of course talking about actual recovery. Your backup is worthless without this part.

Whatever your prefered method may be, if you are unable to read the words on your steel properly, or if you have never tried any recovery attempt from the backup procedure you came up with the whole "how safe is it?" question becomes insignificant.

Like with everything else in life keeping it simple probably beats adding extra layers of security because they add complexity to your restore procedure and might make it impossible to restore over decennia.