I worked for a european investment bank for a number of years, and they had a policy that every year, every employee (without exception) was required to take 2 weeks holiday as a contiguous block, and during that time, their access to the company was removed, so no email access, no remote login, keycard access to the office removed etc. They basically ran the 'suspend this person from the organisation' script and restored you when you returned after your holiday.
This was primarily in place to reduce the risk of fraud in the trading/operations side of the business, but it had the side effect that it made it very obvious if the business depended on someone being in the office, since managers would have to cope with people being off and unavailable for 2 weeks. It of course also covered people leaving, or being hit by a bus etc.
Overall I thought it was a very simple mechanism to avoid the business risk of being exposed to one employee both from a business as usual, and also from a fraud point of view, and also made it much easier for people to free themselves from a particular role.
This was primarily in place to reduce the risk of fraud in the trading/operations side of the business, but it had the side effect that it made it very obvious if the business depended on someone being in the office, since managers would have to cope with people being off and unavailable for 2 weeks. It of course also covered people leaving, or being hit by a bus etc.
Overall I thought it was a very simple mechanism to avoid the business risk of being exposed to one employee both from a business as usual, and also from a fraud point of view, and also made it much easier for people to free themselves from a particular role.