Strictly speaking, you don't need to keep up with any fixed review schedule. Anki understands when you're remembering a card that was part of a backlog, and gives you some "extra credit" for the added time interval that you've incurred as a result. This means that these cards will soon be scheduled with very long recall intervals, which in practice helps you clear the backlog fairly quickly.

Sure, it's not optimal to miss a scheduled recall because then you might forget the card, which is quite bad. But most of the time you'll be doing OK, so it's always worth trying more cards.