[treszkai]

How do you deal with the eventuality of Pinboard going down? (Which will almost certainly happen sooner or later.)

While the civilization doesn't depend on my data, I always like to have a backup, so paying for a service to store my web archive is barely more future-proof than saving links.

[canadianwriter]

You can export the archive and put it on your own harddrive if you want, that's what I do, so I have an offline backup of all sites I have bookmarked.