I saw a discussion comparing cd backup to dvd backup. Comments said dvd disks are still a fragile (less durable) storage compared to CD's. One scratch on a dvd loses more data than a scratch on a cd.
CD's have proved decades as durable storage. DVD's don't have the same track record.
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I did the following after my XP laptop hdd went kaput. I installed a new hd. I found an external hdd enclosure capable of holding my laptop C drive. Then get a couple extra exclosures and hdd's. I installed an OS on each drive, switched things around, did tests, etc.