While the odds of losing the data you have stored in Pocket or similar web services is relatively low, it never hurts to have a backup just in case something bad happens. Someone could get into your account and delete it all, and without a backup, all your years of read and unread content could be unrecoverable.
Pocket doesn’t have a true back up function, but there is a way to at least keep track of the article names, links, and read or unread status through the Export feature. Here’s how:
From your Pocket List, click your name in the upper right-hand corner, and click Options. From there, go to the bottom and click Export.
This will export an HTML file listing all of the articles in your account, sorted into My List and Archive. Your tags will not be included, and articles you’ve Favorited will be within My List or Archive, without any indication that they were Favorited.
It’s not a perfect solution, and there’s no way to import this file back into Pocket, other than manually re-saving each article, but given the choice between this and losing years of reading, this is a start.