SL-Files · Backup & Seal
Offload it once. Prove it forever.
SL-Files copies camera media to up to three destinations in a single read, verifies every byte past the disk cache, and seals each transfer with a certificate you can hand to production. The core workflow is offline and needs no account.
Live now on the Mac App Store
Version 1.0.0 · Free download · No account required
Free download · Verify free forever · first 100 GB of offloads free
Runs natively on Apple Silicon and Intel Macs · macOS 13 or later
What it does
Everything a DIT needs to trust the backup.
Ten things SL-Files does on the cart, in one offline app — not a subscription stack plus a scatter of free side-tools.
Supports a 3-2-1 workflow
Pick a source card and up to three destinations. SL-Files reads the card once and fans the copy out to every drive at the same time — no extra wear on the media.
Verified, not assumed
Every file is checksummed on the way in and re-read byte-for-byte on the way out, past the macOS disk cache — so a failing card, reader or cable is caught, not trusted.
Source re-read for camera cards
For original camera media, SL-Files re-reads the source itself, not just the copies — adding an independent check that the source remains readable before a card is wiped.
xxHash-64, MD5 or SHA-256
Choose your checksum. The progress bar runs red to green and only reaches green once every byte has been verified.
MHL, ASC MHL & JSON sidecars
On every destination, beside your footage: a classic MHL, an ASC MHL manifest with a tamper-evident chain (the ASC/MITC standard some studios now require), and a machine-readable JSON sidecar.
A seal for every transfer
Each offload produces a seal certificate — route, payload, operator, machine, checksum method and full per-file manifest — exportable as a PDF report you hand to post.
Verify any backup
Point SL-Files at a backup made by another tool and it re-checks every file against the drive's own manifest — no copy required. It reads MHL and ASC MHL written by Silverstack, ShotPut Pro, YoYotta and Resolve.
Camera-card detection
SL-Files recognises original camera media and treats it with the extra care an irreplaceable source deserves.
Drive health at a glance
See what macOS knows about every connected drive — SMART status, bus, capacity — before you trust it with a day's work.
Works on the cart, offline
The core offload and verification workflow needs no account or internet. Optional Silverlines linking sends metadata only, never footage.
Free to try
A working trial, not a crippled demo.
Enough to run a real card through copy, verify and seal on a real shoot — before you pay a cent.
Verify free forever
The Verify screen reads any tool's MHL or ASC MHL — Silverstack's, ShotPut's, YoYotta's — and re-checks a backup byte for byte. It never expires and never counts against your allowance.
First 100 GB of offloads free
Run a real card through copy → verify → seal before deciding. The allowance is metered on-device; the engine never interrupts a transfer already in flight.
Unlock unlimited offloads
One in-app purchase lifts the cap. Everything you sealed on the free tier stays valid — nothing to re-run, nothing to migrate.
Pricing
Free to start. Unlock when it pays for itself.
Start with 100 GB free. Then choose the standalone license that fits your cart: monthly flexibility or one lifetime purchase.
- Full copy → verify → seal workflow
- Verify any existing backup — free forever
- MHL, ASC MHL and PDF seal certificates
- No account · works offline
- Upgrade in the app whenever you're ready
- Unlimited offloads
- Everything in the free tier
- Renews monthly until cancelled
- Purchased and billed through Apple
- Standalone license · Silverlines sold separately
- Unlimited offloads forever
- Everything in the free tier
- No recurring subscription
- One purchase, billed by Apple
- Standalone license · Silverlines sold separately
SL-Files is a standalone product. Connecting it to a Silverlines production is optional and does not include or unlock an SL-Files license. Purchases are billed by Apple; local prices may vary. Verifying existing backups is always free.
Questions
Before you trust it with a day's work.
What DITs ask us most about SL-Files.
Is SL-Files available yet?
Yes. SL-Files 1.0.0 is available now as a free download from the Mac App Store.
What's free?
Verifying an existing backup is free forever, and so are your first 100 GB of offloads — enough to run a real card through copy, verify and seal before you decide.
What does it cost to unlock?
After the first 100 GB of free offloads, choose a $19.99 monthly subscription or a $99.99 lifetime unlock. SL-Files is licensed separately from Silverlines; linking the two products does not include or unlock an SL-Files license.
Can SL-Files verify backups made by Silverstack or ShotPut Pro?
Yes. Point SL-Files at a backup made by another tool and it re-checks every file against the drive's own MHL or ASC MHL manifest — no copy required. It reads manifests written by Silverstack, ShotPut Pro, YoYotta and Resolve. Verifying is free, forever.
What is SL-Files Pro?
Pro is a separate direct edition (coming soon) that adds a gated card erase and native volume encryption with crypto-erase on top of everything in the App Store edition. It will require its own license; pricing will be announced at launch.
Does it need an account or the internet?
No. The core offload and verification workflow runs entirely offline and requires no account. Signing in is optional and only links seal metadata to a Silverlines production; it does not include or unlock an SL-Files license, and footage is never sent.
Which Macs does it run on?
The App Store edition runs natively on Apple Silicon and Intel Macs, macOS 13 or later.
Never hand over a card you can't prove.
SL-Files is live on the Mac App Store. Download it free and put your next camera card through a backup you can prove.