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70% of Cybersecurity Pros Often Work Weekends
(www.infosecurity-magazine.com)
This is a most excellent place for technology news and articles.
This shows a really low Bus Factor which should be remedied. If you're on call 24/7 because you're the only person who can fix things then your employer is running the risk of you being unavailable due to injury or disease and then they're up shit creek sans paddle.
There are no bad employees only bad managers, or some karate kid nonsense like that. I had a job where I was "on call" 24/7 with no one else as alternates. I kept getting in trouble for not being available on the weekend when they called me. Most of the other employees I worked with in similar positions admitted to drinking every night that way they couldn't get called in after hours. I quit that job quick.