If a billion dollar company like Mozilla can't be bothered to keep its Pocket archiving service running, it's something of a risk to rely on a lone developer, no matter how talented or well intentioned. Instead, how about self hosting your own article archiving service on your own computer gear? That way, you own it all and nobody can shut it down. Also: Pocket is shutting down here's how to retrieve what little data you still can As it turns out, there's an open source...
