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#11
Keep Staggered Images
I recommend you keep a number of images across a period of time.
I keep
1) an early image with my current licensed software installed.
2) Keep an additional image to 1) when you add a significant piece of paid software.
3) Keep ~ 3 images over the last month or two.
This is a practical way to quickly get going again even when your internal HDD fails.
If you have licensed software and / or just a customized configuration, a Clean Install can be a real time consuming nuisance.
I have found on a number of occasions running system repair can take a very long time only to fail to fix a fault.