Copies that save you.
WHAT A BACKUP IS
A separate copy, from a point in time, that the live system cannot alter.
WHAT IT IS NOT
A second copy on the same machine A synchronised folder A cloud service alone
WHAT TO BACK UP
Documents and work files Photographs Anything you could not recreate Configuration and licences
WHERE TO KEEP IT
Somewhere separate: an external drive kept disconnected, or a backup service.
WHY DISCONNECTED
A drive left connected is affected by whatever affects the machine.
HOW OFTEN
As often as you could afford to lose work.
WHAT TO KEEP
Several versions from different dates.
WHY
A recent backup may already contain a problem you have not noticed.
WHAT TO TEST
Restoring something, at least once.
WHY
An untested backup is an assumption.
WHAT PEOPLE DISCOVER
That something important was never included.
WHAT TO AUTOMATE
The backup, so it does not depend on remembering.