For me it is not recording credentials with the assumption I would simply remember them later, while having every opportunity to archive them before eventually forgetting. Also, not keeping detailed enough notes & photos of exactly how my hardware is attached.

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[–] 5 points 1 year ago

Not costly in anything but time, but I tried to crossgrade an i386 server to x86_64. Eventually it got broken enough that I restored from a backup and just rebuilt a new server from scratch in a VM to replace it.

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