guide·Storage & Files

3-2-1 Backup Strategy

Three copies, two media types, one offsite—the rule that prevents total data loss.

DIYLOCAL-FIRSTFAMILY-FRIENDLY

Quick facts

Price model: Strategy
Best for: Family photo protection · Anyone scared of losing phone pictures · Simple backup planning
Replaces: Only backing up to iCloud or Google, Losing everything if one drive fails
Last verified: 2026-06-22

Why it's listed

Simple rule everyone cites but few implement—this makes it actionable with free tools.

Explains how to combine local drives, Syncthing, and optional cheap cold storage without overpaying for redundant cloud tiers. Framework works with free tools and one-time hardware.

The catch

Jump to setup guide ↓

Initial setup takes a weekend; offsite copy means giving a drive to a trusted relative.

How to set up 3-2-1 Backup Strategy

Three copies, two media types, one offsite—household data that survives a stolen laptop or dead drive.

Time: 20–30 min
Difficulty: Easy
Verified: 2026-06-22

Before you start

List what matters: photos, documents, passwords vault, budget files
One external USB drive
Trusted offsite destination (relative, safe deposit, encrypted cloud)

Copy 1 — live data
Files on laptop/phone/NAS you use daily. This copy is at risk every day—that's why you need 2 and 3.
Copy 2 — local backup
External drive + FreeFileSync scheduled weekly for Documents, Photos export, password vault export, budget .db.
Copy 3 — offsite
Monthly USB swap to parent's house OR encrypted cloud sync of critical folders only—not your entire downloads folder.
Test restore
Once a year: pull one file from offsite copy on a different computer. Untested backup is faith.
Label and calendar
Sticker drives with date. Calendar recurring Backup Sunday 15 minutes.

Troubleshooting

Backup drive full: Photos dominate—archive old years to second drive labeled Archive 2024.
Never remember to run sync: Automate FreeFileSync; keep drive plugged into home server not laptop.
Ransomware fear: Offline rotation—unplug drive when not syncing; cloud copy immutable if provider supports.