Yes, except “hire enough people”. You can’t staff enough to cover 4 out of 8 employees off from a combination of sick, bereavement, and vacation.

It happens. All you can do is prioritize tasks, make it work the best you can with the resources you have, and manage expectations.

If the work can’t be rescheduled, and isn’t worth paying someone OT to cover, well, then, it’s not worth doing.