I once had to go on a longer medical leave, couple of months. In preparation, I documented everything - pages upon pages answering all questions in easily searchable formats. For more than a month, any questions I got were answered with links to specific sections in the documentation, so people would know where to find everything. I put the links everywhere, in total there were at least 200 links to various sections of the documentation throughout all our communication mediums, as well as all information repositories.

After I came back from leave, most of the things I was responsible for were turned off. When I asked why, the response was "we didn't find your documentation".

I no longer care whether things keep working.