Its not an every day an event Pokemon distributed over 25 years ago can be backed up and archived, however today is a rare day when that happens!
Reddit user Neocaridina discovered he still had a UK Gen 1 event Mew distributed at the Bluewater Shopping Center in Kent, England back in the year 2000.
Gen 1 and 2 event Pokemon are living on borrowed time, as the Pokemon game cartridges have an internal battery which keep's the save, once this battery runs out the save is unfortunately lost. So its a great win for Pokemon Event preservation that another Gen 1 event Pokemon could be backed up and not lost forever.
Read more on the event download thread: Pokemon GEN1 Legit UK Mew Event Download
