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Right, it's a local, sharable copy. Actually Readability cuts off so much HTML, that it's quite possible that 2 users will generate the same hash even from very dynamic website.

Really?

What kind of hash are we talking about here? And generated from what?

I could imagine the opposite, generating 2 hashes from the 'same' article, due to different markup being stripped. Not what you suggest though.

Unfortunately it's unlikely to be a backup, since everything will only live on your local computer. You might get the content from some other user if, by chance, they generated the exact same bytes, but it's rather unlikely.

To back things up, you'll want to pin to an external server like Eternum.io.

If you export your bookmarks you could autoparse them and ipfs pin and ipfs links to a longer lived archival node running on you main host or offsite/cloud.

You could plug IPFS Cluster's proxy endpoint (:9095) instead of the IPFS daemon API endpoint and get everything you add replicated to a backup peer.