--- title: "How to use Backblaze B2 from a Mac" description: "Connect your Mac to Backblaze B2 through its S3-compatible API: create an application key, enter its region in AnyBucket, then upload, back up and sync with F5." url: https://anybucket.app/guides/backblaze-b2-mac lang: en --- # Backblaze B2, from your Mac B2 has an S3-compatible API, so AnyBucket connects to it like any S3 store. You need an application key and the region your bucket lives in. ## The short answer In your Backblaze account, create an **application key** for your bucket and note its **keyID** and **applicationKey**, plus the bucket's **region** (for example `us-west-004`, from its S3 endpoint). In AnyBucket, press **⇧⌘K**, pick **Backblaze B2**, type the region, paste the key ID as the access key and the application key as the secret, and connect. AnyBucket uses the endpoint `https://s3..backblazeb2.com`. ## Before you start AnyBucket talks to B2 through its **S3-compatible API**. You need: - A **bucket**. Its details in the Backblaze web interface show an **S3 endpoint** such as `s3.us-west-004.backblazeb2.com`. The part between `s3.` and `.backblazeb2.com` is the region. - An **application key** that may read and write that bucket. Backblaze shows a **keyID** and an **applicationKey**; these are the access key ID and secret access key in S3 terms. ## Create an application key 1. Sign in to your Backblaze account and open the page for application keys. 2. Add a new application key. Allow access to the one bucket you'll use, with read and write access. 3. Create it and copy the **keyID** and the **applicationKey**. Backblaze shows the application key only once, so copy it before you leave the page. ## Connect in AnyBucket 1. Press **⇧⌘K** (**File → Connect to Server…**). 2. Under **Cloud Storage**, pick **Backblaze B2**. 3. Type the bucket's **region**, such as `us-west-004`. AnyBucket builds the endpoint `https://s3.us-west-004.backblazeb2.com`. 4. Paste the **keyID** as the access key ID and the **applicationKey** as the secret access key. With **Save Secret in Keychain** on, it goes to your login keychain. 5. Optionally type the bucket name and a nickname, then press **Connect**. ## Back up a folder to B2 B2 is a common home for off-site backups. With AnyBucket: 1. Put the folder from This Mac in one pane and the B2 bucket in the other. 2. Press **⌥F5**. Compare & Sync lists every file that's new, changed or missing on each side. 3. Choose **mirror** to make the bucket match the folder, check the rows, and start it. Large files go up in parts, and a dropped connection retries on a fresh one. If you quit AnyBucket, the queue picks up again at the next launch. See [sync a folder with a server](https://anybucket.app/guides/sync-folder-with-server). ## Move files to or from another provider To move a bucket from Amazon S3, Wasabi or Cloudflare R2 to B2, or the other way, open one in each pane, mark the files and press **F5** to copy or **F6** to move. Files stream through a small spool on your Mac; you don't download anything by hand. See [copy files between servers](https://anybucket.app/guides/copy-files-between-servers-mac). ## If it doesn't connect - **Access denied:** the application key may be limited to another bucket, or be read-only. - **Nothing listed, or an error about the endpoint:** check the region. It must match the bucket's own S3 endpoint. - **A transfer stopped:** it waits under **Needs attention** in the Transfers window (⌥⌘T) with its error. See [troubleshooting](https://anybucket.app/support/troubleshooting#stopped-transfers). ## Questions, answered ### Is there a Backblaze B2 app for Mac? AnyBucket works as one: it connects to B2 through the S3-compatible API, shows a bucket like a folder beside your Mac, and copies, moves and syncs with the keyboard. ### Which region do I type? The one in your bucket's S3 endpoint: for `s3.us-west-004.backblazeb2.com`, type `us-west-004`. ### Can I keep a folder backed up to B2? Yes. Compare & Sync (⌥F5) compares the folder with the bucket and mirrors the changes, listing every file before anything moves. ### Which key is the access key and which is the secret? Backblaze's **keyID** is the access key ID, and its **applicationKey** is the secret access key. ## Read next - [Amazon S3 and compatible](https://anybucket.app/features/s3) - [S3 client for Mac](https://anybucket.app/guides/s3-client-mac) - [Sync a folder with a server](https://anybucket.app/guides/sync-folder-with-server) - [Cloudflare R2 on a Mac](https://anybucket.app/guides/cloudflare-r2-mac) **Buy for $9.99:** https://buy.polar.sh/polar_cl_pCF9yOjezTUaUqMPyUsxEho1EjcOvo6Bk49Q929LQCQ --- AnyBucket is independent software by [Clever Mechanisms](https://clevermechanisms.dev). It is not affiliated with, endorsed by or sponsored by Apple Inc. or any storage provider. Independent software in the spirit of Cyberduck and the classic two-pane commanders. Not affiliated with iterate GmbH (Cyberduck). Apple, Mac, macOS, Finder and Quick Look are trademarks of Apple Inc., registered in the U.S. and other countries and regions. Amazon S3 is a trademark of Amazon.com, Inc. Other product names are trademarks of their owners. Email support: support@clevermechanisms.dev