[ashkankiani]

Depending on the size of your files, burn a burn of duplicate DVDs or BDs. They have the longest lifetime in cold storage tradeoff vs equipment/money investment. Period. Store those disks in a fireproof bag or box and they're pretty much there for a lifetime.

[yupyup54133]

Yeah, just make sure the DVDs or BDs you buy have HTL (i.e. use inorganic dye).

[vinniejames]

This is definitely true, most cheaper discs degrade after a few years.

The issue you're forgetting to mention is the fact that physical DVD drives won't be around for more than a few more years, you then need to make sure you have one in working order on a system that can use it