Article:
“those who hoard information and techniques so that getting rid of them is impractical”
That is what every employee should strive to be....but....
The managers may be so stupid that they don’t even know how important you are.
The best way around that problem is to make sure the competitors know how valuable you are even if your own managers have no clue.
About the last 20 years of my IT Career I was a contractor doing Cisco System installs/configuration for routers, switches, and Voice related products.
I always kept an updated resume online just in case, as a contractor you never knew when a company might decide to cancel a project and the project will end some day.
Plus, someone may see your resume and make you an offer that is too good to turn down, as a contractor you are very dispensable but get paid very well.