This is a card that you'll see only in criminal. If you use cards like Shiv, Crowbar, Spike, Spy Camera, Grappling Hook, Flip and other trashable cards, it allow you to get those back. Of course, it is mainly played with Geist, because Geist ID is best used with trashable cards. Note that Az can make good use of this card also.
There is another card like this : Trope. So, lets compare.
If installed early, Trope will be able to bring back a massive number of cards. The drawback is that Trope take up 1 MU. Otherwise, you can have multiple instance of Trope installed. Trope can bring back any cards, even events cards. But outside of Anarch, Trope cost 3 influence, so it must become a core piece of the deck strategy.
The Back does not take MU, but has multiple requirements. First, you must make a run AND use a piece of HARDWARE. There are not that many piece of hardware that can be used. The most obvious are Boomerang, Spy Camera, Sports Hopper, Prognostic Q-Loop, Masterwork v37, Flip Switch and Simulchip. This is what make this card best used in criminal, because you need a lot of support from other criminal cards. The good part is, The Back will bring you double the amount of trashable cards, which let you use hardware outside of a run.
I will not compare with Labor Right and Harmony AR Therapy, but they could be used for a similar effect. Also, if you have the setup for it, Rip Deal could be used to bring back cards. But those events are for a different strategy.
This make The Back an essential card, if you use multiple trashable cards, allowing you to make the game viable with trashable cards. At 1 cred, you should absolutely use it if you play lots of trashable cards.
Kudos to the artist, it is perfectly done, even the quote, to encapsulate the meaning of the card.
Have to add that Trope has a bit of an advantage in that it's a program and therefore can be tutored, while tutoring resources is a bit harder— Shieldwall
Fun fact: This card says up to, while Trope shuffles back EXACTLY X cards, which has bitten me in the back more often than I'd like to admit.— Krams
@Krams, I had not caught on that part of Trope. This is a major thing. It means you have to keep in mind when to pop Trope. From the feel of it, I think you should not let Trope build to more than 9, for it will dilute the probability of getting the correct cards. But I might be wrong and there will be edge cases where you need the most cards possible. But that drawback is balanced by what @Shieldwall said, Trope can be tutored and The Back cannot.— Diogene