Your old backup is about to become unreadable
After spending a few hours in the past weekend, copying old photographs and various other files from CD’s and DVDs in the archive, I have sadly learned that discs do have a limited durability. Out of 24 CD-R’s my computer was unable to read 6 of them. For the record, the CD-R’s were burned in the years 2000 and 2001 and are of various brands. If you have precious data on CD’s or DVDs, my advice to you is to back it up on other media - now.