Protecting data properly.
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 drive array
WHAT THE TYPES ARE
- Full: everything, every time
- Incremental: only what changed since the last backup of any kind
- Differential: everything changed since the last full backup
WHAT THAT AFFECTS
Backup time and storage used Restore time and complexity
WHY INCREMENTAL RESTORES ARE SLOWER
They require the full backup and every increment since.
WHAT A COMMON APPROACH IS
Several copies, on more than one kind of medium, with at least one held elsewhere.
WHY ELSEWHERE
So a local disaster does not destroy both.
WHY ONE OFFLINE OR SEPARATED
So ransomware or a mistake cannot reach it.
WHAT TO ENCRYPT
Backups, which contain everything.
WHAT TO TEST
A restore, on a schedule.
WHAT TO MEASURE
How long a full restore takes, and how much data would be lost.
