Folder3 — The backup of your backups. Rule of 3-2-1, solved.

The 3-2-1 rule

The oldest rule in IT.
Still the one that saves you.

Ask any sysadmin who's survived a ransomware hit, a flood, or a dead RAID controller. The rule is simple — and almost everyone skips the last step.

Three copies of your data

The original, plus two backups. Copies one and two live with you — the third copy is Folder3.

Two different media

Local disk, NAS, tape — different tech fails differently. Don't let one bad firmware update eat both copies.

One copy offsite

Fire, flood, theft, ransomware — they take the whole building. Your third copy lives offsite with us, outside the blast radius.

disaster-recovery — bash

$ ls /mnt/backup-1

ls: cannot access '/mnt/backup-1': Input/output error

$ ls /mnt/backup-2

ls: encrypted by ransomware (.locked)

$ folder3 restore --latest

Verifying snapshot 2026-08-05T03:00Z … checksum OK

✓ 1,284,772 files restored. Zero data loss.

$ exhale

Why a third copy

The first two copies share your fate.

Your local backup and your NAS live in the same building, on the same network, behind the same login. Whatever gets your data — ransomware, fire, theft, a fat-fingered delete that syncs everywhere — usually gets them too.

Folder3 lives somewhere else entirely: offsite, immutable, and air-gapped from your credentials. When copies one and two go down together, the third one is the reason it's an incident report, not a resignation letter.

Features

Built to be the copy that survives.

Immutable snapshots

Write-once storage with configurable retention locks. Ransomware can't encrypt what nothing can overwrite — not even an admin account.

End-to-end encryption

AES-256, encrypted before it leaves your machine. Your keys stay with you — we couldn't read your data if we wanted to.

Continuous verification

Every snapshot is checksummed and test-restored automatically. A backup you've never restored is a rumor, not a backup.

Incremental forever

After the first sync, only changed blocks move. Terabytes upstream, kilobytes per night — your bandwidth barely notices.

Geo-redundant storage

Your third copy is itself stored across multiple regions. We apply the 3-2-1 rule to the copy that completes your 3-2-1 rule.

Works with your stack

Agents for Windows, macOS, and Linux. S3-compatible API, rsync/rclone targets, and hooks for Veeam, Proxmox, and TrueNAS.

How it works

Three steps. Fitting, right?

Connect your sources

Install the agent or point your existing backup tool at your Folder3 bucket. One command: folder3 init.

Set your policy

Choose schedule, retention, and immutability windows. Sensible 3-2-1-friendly defaults out of the box.

Sleep through the disaster

Snapshots sync, verify, and lock automatically. When the bad day comes, restore from anywhere — always free.

Pricing

Cheaper than the disaster.

Flat, predictable storage pricing. No egress fees, no restore fees, no surprise line items on the worst day of your year.

Personal

$4 / month

For your home lab and family photos.

1 TB storage included
Immutable snapshots
End-to-end encryption
Free restores

Start trial

Pro

$6 / TB / month

For freelancers, studios, and small teams.

Unlimited storage, pay per TB
Automated restore testing
S3-compatible API access
Multi-device & NAS support
Priority support

Start Pro trial

Business

Custom

For MSPs and IT teams with compliance needs.

Everything in Pro
SSO & role-based access
Compliance retention locks
Audit logs & reporting
Dedicated onboarding

Talk to us

3–2–1

You've got copies one and two.
We're copy three.

Complete the rule in the next ten minutes. Your future self — the one staring at two dead backups — says thanks.

Start your third copy

The oldest rule in IT.Still the one that saves you.