That sort of damage can result in loss of data, yes. (If the cracks spread into the platter, and thus allow oxygen hit the dye, the discs is immediately dead.)

Just copy the discs to new discs. You can keep the old ones if you want, and use those as the primary. Use the new burns as secondary.

Standard backup policy.

these discs were manufactured in 2010 and already has four years that were made​​, I bought them in 2013 and since then keep them stored and not increased the crack and no corrosion or oxidation

I have 4 identical to this disc, 1 of them does not work but has no corrosion and other discs dvd had good burning windows 8

I think there should be no more problems and I will keep them stored for some years after these years I'll burn the files on best medias

I am correct?