Short write-ups on tooling, storage, and everyday operations.
Most of the pain with storage shows up two years after the decision, not on the day you make it. A few habits that have aged well: keep the boot volume boring, put anything that grows on its own filesystem, and write down why you chose a size.
Rotation settings tend to be copied between machines without much thought. It is worth doing the arithmetic once: peak write rate times retention window, plus headroom for the day something goes wrong and starts logging in a loop.
Restore drills are tedious and always get postponed. The compromise that works: restore one small thing every month, and one whole system once a year. Keep a short log of how long each took.