Those tips will save you if there is an emergency.
I was out a few weeks for surgery in Houston, Texas with coverage by our home office in London.
The London developers always ridiculed me for excess documentation. The business managers used that documentation to train new employees.
When I returned, I received this email from one of the business department heads: “I didn’t know how spoiled I was until you were out.” They added one more person to our programming staff.