Just as an extra note, keeping backups should be strongly encouraged, but self-burned CD/DVD/BluRay are extremely easy to get scratched and then no longer be readable. The store bought disks have an extra plastic layer on the bottom that protects the actual data section of the disk, but in order to be able to burn them at home this extra plastic layer cannot be present. Thus any scratches/scuffs immediately damage the underlying data not just the plastic protection.
Just as an extra note, keeping backups should be strongly encouraged, but self-burned CD/DVD/BluRay are extremely easy to get scratched and then no longer be readable. The store bought disks have an extra plastic layer on the bottom that protects the actual data section of the disk, but in order to be able to burn them at home this extra plastic layer cannot be present. Thus any scratches/scuffs immediately damage the underlying data not just the plastic protection.