Backblaze B2 client for macOS
A Backblaze B2 Client for Mac - Inside a Real File Manager
Backblaze doesn't ship a Mac GUI for B2 - EmpiricCommander fills that gap. Browse your B2 buckets through the S3-compatible API in a native dual-pane window: B2 on one side, your Mac (or another cloud) on the other. Upload, download, batch rename, and verify transfers - on macOS, iPad, and iPhone.
$49.99 one-time · no subscription · macOS, iPad & iPhone
No CLI, no third-party sync tool
That's the whole setup
Folder Sync checksums each copy
What you can do with B2 in EmpiricCommander
Browse buckets natively
Your B2 buckets appear as a pane in a real file manager - navigate, preview, Quick Look, and search like a local folder.
Dual-pane transfers
B2 in one pane, local disk or another cloud in the other. Drag to upload or download; queue and monitor large transfers.
Migrate between clouds
Copy straight from Amazon S3, Google Drive, or any connected backend into B2 - or out of it - without a visible intermediate download.
Verify with SHA-256
Migrate with Folder Sync and every file is hashed on both sides after it lands - a mismatch deletes the bad copy instead of leaving it there.
Keys in the Keychain
Your B2 application key lives in the macOS Keychain - never in plaintext config files.
Terminal at hand
A full terminal is one keystroke away for everything a GUI shouldn't do - synced to the active pane's directory.
Connect to B2 in 30 seconds
B2 speaks the S3 protocol, so it connects like any S3-compatible endpoint. You need two things from your Backblaze account: an application key and your bucket's endpoint.
- In Backblaze: App Keys > Add a New Application Key (note the keyID and applicationKey)
- Find your S3 endpoint on the bucket page - it looks like s3.us-west-004.backblazeb2.com
- In EmpiricCommander: New Connection > S3, pick Backblaze B2 from the Service list (or Custom / Self-hosted with the endpoint above), keyID as Access Key, applicationKey as Secret Key
- Connect - your buckets appear in the pane
B2's S3-compatible API works with application keys created after May 2020; legacy b2 buckets may need a new key. The one-click Backblaze B2 preset ships in EmpiricCommander 1.7.1 - on earlier versions, the Custom / Self-hosted path works the same.
Migrate to B2 - and verify every byte
Moving a bucket from Amazon S3 to B2 to cut storage costs usually means rclone and a leap of faith. In EmpiricCommander you connect both providers and run the move through Folder Sync: each file is hashed on both sides after it lands, remote to remote included, and a checksum mismatch removes the bad copy rather than leaving it in the destination bucket. Size-and-date comparison would not have caught it.
- Cross-cloud copy: S3 to B2, B2 to local, B2 to Google Drive
- SHA-256 checksum after every Folder Sync copy, with progress and cancel
- Batch rename and Auto-Organize work on B2 files too
Like rclone, transfers pass through your device - bandwidth applies. For multi-terabyte one-time migrations, a server-side tool may fit better; for everything after, a file manager beats a config file.
On your Mac, iPad, and iPhone
The same B2 connection works on the native iPad and iPhone apps under one license - check a bucket or pull a file from wherever you are. One $49.99 purchase covers 1 Mac + 1 iPad + 1 iPhone. No subscription.
Frequently Asked Questions
Does Backblaze B2 have an official Mac client?
No - Backblaze provides a web console and a CLI, and points GUI users to third-party apps. EmpiricCommander connects to B2 via its S3-compatible API and gives you a full native file manager around it.
How do I connect EmpiricCommander to B2?
Create an application key in your Backblaze account, then add an S3 connection in EmpiricCommander and pick Backblaze B2 from the Service list - enter the keyID as the access key and the applicationKey as the secret. On versions before 1.7.1, choose Custom / Self-hosted and add your bucket's endpoint (e.g. s3.us-west-004.backblazeb2.com).
Can I migrate from Amazon S3 to B2 with it?
Yes. Connect both providers and either drag between panes, or - better for a migration - run Folder Sync, which checksums every file on both sides after copying it and removes any copy that fails. Transfers pass through your device, like rclone.
Where are my B2 keys stored?
In the macOS Keychain (and the equivalent secure storage on iPad and iPhone) - never in plaintext files.
Does it work on iPhone and iPad?
Yes - native macOS, iPadOS, and iOS apps with one $49.99 one-time license covering 1 Mac, 1 iPad, and 1 iPhone, with a 7-day free trial.