> or just skip some days and have it adjust accordingly, instead of just leaving me with a huge back log.

Unfortunately memory does not work that way. You can't just put a pause on forgetting (if we could we wouldn't need spaced repetition in the first place). The backlog will continue to grow because memory degrades over time (without review). The backlog simply represents the cards that have a less than X% chance of being recalled (where X is usually 80-90%).