I'd extend this to regular vacations too. I've worked a lot in both Europe and the USA. In Europe everyone had to know other people's knowledge as people were r

I'd extend this to regular vacations too. I've worked a lot in both Europe and the USA. In Europe everyone had to know other people's knowledge as people were regularly out of the office. In the US it was easier to rely on someone as people rarely were out for a week and if they were they usually were local and on call.