Streaming backup, live right now
Never lose
a thing.
Fast is continuous, invisible backup. It streams every change off your machine as it happens — end-to-end encrypted — so the current version of everything is always safe, and always one click from coming back.
Also on Windows & Linux · Free to start · No account required to try
Backup that streams.
Undo that works.
How it works
Invisible until the day
you need it.
No scheduled jobs. No “last backup: 6 days ago.” Fast watches your filesystem and streams every change the moment it happens.
Continuous streaming
Incremental, block-level uploads within seconds of a change. Your backup is never hours old — it's never even minutes old.
Encrypted end-to-end
Everything is encrypted on your device with keys only you hold. We can't read your files. Neither can anyone else.
Instant restore
Any file, any folder, any point in time. Slide back to the version you want and it's on your disk in seconds — not a support ticket.
One engine, three surfaces
For humans and machines.
Humans
A menu-bar app that just sits there and works.
Pick the folders that matter. Fast handles the rest — quietly, in the background, on Mac and Windows. You'll forget it's there until the day it saves you.
- Real-time, incremental, deduplicated
- Bandwidth-aware — never fights your video call
- Restore from the menu bar in two clicks
Servers & power users
The same stream, in a CLI.
A single static binary for Linux. Scriptable, resource-light, and built for fleets. Point it at a path and it keeps that path immortal.
- One-line install, no daemon babysitting
- S3-compatible under the hood — your tooling still works
- Zero egress fees when you need to pull data back
$ curl -fsSL fast.inc/install | sh
$ fast watch /var/lib/postgres
✓ streaming e2e-encrypted · edge.network
✓ restore point every write
$ fast restore /var/lib/postgres --at "before the crash"
✓ restored 4.2 GB in 18sAgents & LLMs
The undo button for AI.
Agents act fast and break things. Fast gives every agent run a checkpoint-aware safety net: capture state before a tool call, roll back the moment something goes sideways.
- Structured checkpoints: files + conversation + tool state
- Diff-aware rollbacks — undo the last 47 tool calls, reliably
- Simple APIs designed for agent frameworks
from fast import checkpoint
cp = checkpoint.capture("before-refactor")
agent.run(task)
if not tests.passing():
cp.rollback() # files, convo, tool state — all of itThe intelligence layer
Not dumb file sync.
Your history, made useful.
Every version of everything you've ever had, searchable in plain language. Recovery becomes a conversation, not an archaeology dig.
Time-aware search
Semantic + exact search across your entire backup history, not just what's on disk today.
Natural-language recovery
“Show me the last good version before the bad agent run.” That's the whole workflow.
What changed this week?
Insights across your machine: what moved, what grew, what an agent touched while you slept.
Anomaly detection
Mass deletions, encryption events, runaway processes — Fast notices, snapshots, and flags a suggested restore point.
Security
Private by architecture.
Encryption isn't a checkbox — it's the design. Files are encrypted on your device before a single byte leaves it.
- End-to-end encryptionKeys are generated and held on your device. Zero-knowledge: we can't read your data, ever.
- Client-side everythingIndexing and search embeddings are computed locally. Intelligence without exposure.
- Tamper-evident historyEvery restore point is content-addressed and verifiable. What you restore is exactly what you had.
Storage
Edge-native. Zero egress.
Built on edge.network — global, S3-compatible object storage at the edge. Fast and cheap by design.
Your files. Always current.
Always recoverable.
Set it up in two minutes. Forget about it forever.
Free for your first 100 GB · E2E encrypted · Cancel anytime, keep your data