Chapter 02 — Technology & Internet
How do I back up my computer?
Follow 3-2-1: three copies of your data, on two different media, with one off-site. In practice: your laptop's drive, an external SSD refreshed weekly, and a cloud backup like Backblaze or iCloud/OneDrive.
Follow-up questions
Is iCloud a backup?
It's a sync service — deleting a file locally deletes it in iCloud too. Use a dedicated backup tool alongside sync.
How often should I back up?
Continuously if possible (Time Machine, Backblaze). Anything unbacked between now and your last snapshot is at risk.
What about ransomware?
Off-site or versioned backups are the answer — attackers can't encrypt what they can't reach or overwrite.
Best external drive?
A USB-C SSD (Samsung T7, SanDisk Extreme) — faster and more durable than spinning disks.
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