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Re:Ask HN: What huge mistake did you make early in your career? by codegeek on Sunday June 20, 2021 @10:55AM (#27570623)
SO many lessons here for a lot of people.

1. Always do backups. REMOTELY. OFFSITE.

2. Check your backups regularly. Make sure you can restore from them if needed.

3. Don't ask Interns to run delete commands casually. Heck, don't run deletes casually at all.

4. See #1.

5. Don't be a dick. This was really bad for the firm but having worked at investment banks myself, people can be dicks especially in high pressure environments like that.

Re:Ask HN: What huge mistake did you make early in your career? by mint2 on Monday June 28, 2021 @11:23AM (#27663101)
6. What people tell you they want done and what they actually want done are often completely different.
Re:Ask HN: What huge mistake did you make early in your career? by oblio on Sunday June 20, 2021 @05:54PM (#27574252)
Never test backups, always test restores.