It's actually defined in the article:
ユネスコの「記憶遺産」は、世界の古い文書などを保存して多くの人に紹介しています。
and is probably a reference to the Memory of the World Programme run by UNESCO.
Because newspaper headlines are written to be extremely compact, you may find on occasion that the headline is unclear until after you've read the rest of it.
So it is only a reference to that program run by the UN to try and define "stored memories" into japanese. I thought it may have been a word like the English archive.
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