In one file, mountains.ai, we wanted to separate three aspects  and save them individually for use in the video. In After Effects, the mountains, hill, and water would have to be saved as three separate PNGs for animation. We deleted all but the hill, exported, then undid our changes and repeated with the mountains and water, allowing us to import each one at a time for animation.

We also began saving backups to our computer at lunch, the end of the day, and after making significant changes.