On March 18, 2019, it was revealed that Myspace had lost all of its user content from launch until 2015 in a botched server migration with no backup. Over 50 million songs and 12 years' worth of content were permanently lost.[102] In April 2019, the Internet Archive recovered 490,000 MP3s "using unknown means by an anonymous academic study conducted between 2008 and 2010". The songs, which were uploaded between 2008 and 2010, are collectively known as the "MySpace Dragon Hoard".[103]
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https://en.wikipedia.org/wiki/1965_MGM_vault_fire
https://en.wikipedia.org/wiki/1978_National_Archives_vault_f...
https://en.wikipedia.org/wiki/2008_Universal_Studios_fire
Also related: https://en.wikipedia.org/wiki/Myspace#Music
If M-DISCs were caught in a fire, I don't think they are readable either.
Film is often stores in actual bunkers because its so dangerous