Backblaze B2

Backblaze’s object storage, popular for backups at commodity prices.

Not yet tested live

What Mountit does with it

Mount
Read and write, in Finder
Offline cache
Metadata cache, read-ahead and write-back — the same volume stack as every other service
Encryption layer
Available on this connection: client-side, rclone-compatible crypt over the data before it leaves your Mac
Editions
Both. Either edition mounts it through File Provider, so it appears in Finder — and, on Standard, in the Files app on iPad and Vision Pro

Limits

What Backblaze B2 cannot do, read from the app's own service_traits() — the same answer its connection picker shows before you connect, not a judgement typed onto this page.

Prefixes, not directories
There are no real directories in this store — a “folder” is a shared prefix on the object keys. Making one writes a zero-byte marker object so the empty folder you just created is still there when you look again; a folder that only ever existed because files were under it has no marker, and goes when its last file goes. Anything that depends on an empty directory persisting has to know that.
A move is a copy, then a delete
This service has no server-side rename, so renaming or moving a file copies the bytes to the new name and only then deletes the old one — that order, so an interrupted move leaves your file where it was rather than nowhere. What it costs is a full transfer of the bytes, which is worth knowing before you drag a large folder. On this store a folder move is refused as a single operation and done file by file, because moving the one key that names the folder would leave everything under it orphaned.

The engineering ledger does not list Backblaze B2 among the services run against a real server, so this page does not claim it was. That is read out of docs/BACKEND-COVERAGE.md in the app repository when this site is built — the build fails rather than let this page claim more than the ledger does.

The conformance record

No lane yet. No server has been stood up to run the corpus against this service, so there is no record to publish. That is the honest answer, not a pending one. Every service’s standing, side by side.

Backblaze B2 questions

Can Mountit mount Backblaze B2?

Yes — Backblaze B2 is one of the 38 services selectable in the app. It mounts read-write, with the same cache, read-ahead and write-back as every other service.

What we will not do is claim it works before it does: this page carries the ledger’s evidence level for Backblaze B2, and it changes the day the evidence does.

Which edition do I need?

Either — this service is in both editions. The difference is the surrounding app, not the protocol: Mountit Pro is the unsandboxed build with the block protocols; Standard is the Mac App Store build, and on iPad and Vision Pro every service appears in the Files app. Both mount this service through File Provider.

Native API or the S3 endpoint?

Either. Mountit speaks B2’s own API, and the S3 gateway Backblaze provides is one of the presets on the S3 page. The native API is the more direct route; the gateway is there if your credentials are already S3-shaped.