RClone - Backblaze B2

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Backblaze B2

B2 is Backblaze’s cloud storage system.

Paths are specified as remote:bucket (or remote: for the lsd command.) You may put subdirectories in too, eg remote:bucket/path/to/dir.


Here is an example of making a b2 configuration. First run:

rclone config

This will guide you through an interactive setup process. You will need your account number (a short hex number) and key (a long hex number) which you can get from the b2 control panel.

No remotes found - make a new one
n) New remote
q) Quit config
n/q> n
name> remote
Type of storage to configure.
Choose a number from below, or type in your own value
 1 / Amazon Cloud Drive
   \ "amazon cloud drive"
 2 / Amazon S3 (also Dreamhost, Ceph)
   \ "s3"
 3 / Backblaze B2
   \ "b2"
 4 / Dropbox
   \ "dropbox"
 5 / Google Cloud Storage (this is not Google Drive)
   \ "google cloud storage"
 6 / Google Drive
   \ "drive"
 7 / Hubic
   \ "hubic"
 8 / Local Disk
   \ "local"
 9 / Microsoft OneDrive
   \ "onedrive"
10 / Openstack Swift (Rackspace Cloud Files, Memset Memstore, OVH)
   \ "swift"
11 / Yandex Disk
   \ "yandex"
Storage> 3
Account ID
account> 123456789abc
Application Key
key> 0123456789abcdef0123456789abcdef0123456789
Endpoint for the service - leave blank normally.
Remote config
account = 123456789abc
key = 0123456789abcdef0123456789abcdef0123456789
endpoint = 
y) Yes this is OK
e) Edit this remote
d) Delete this remote
y/e/d> y

This remote is called remote and can now be used like this:

See all buckets:

rclone lsd remote:

Make a new bucket

Make a new bucket
rclone mkdir remote:bucket

List the contents of a bucket:

rclone ls remote:bucket

Sync /home/local/directory to the remote bucket, deleting any excess files in the bucket:

rclone sync /home/local/directory remote:bucket

Modified Time

The modified time is stored as metadata on the object as X-Bz-Info-src_last_modified_millis as milliseconds since 1970-01-01 in the Backblaze standard. Other tools should be able to use this as a modified time.

Modified times are used in syncing and are fully supported except in the case of updating a modification time on an existing object. In this case the object will be uploaded again as B2 doesn’t have an API method to set the modification time independent of doing an upload.

SHA1 checksums

The SHA1 checksums of the files are checked on upload and download and will be used in the syncing process. You can use the --checksum flag.


When rclone uploads a new version of a file it creates a new version of it. Likewise when you delete a file, the old version will still be available.

The old versions of files are visible in the B2 web interface, but not via rclone yet.

Rclone doesn’t provide any way of managing old versions (downloading them or deleting them) at the moment. When you purge a bucket, all the old versions will be deleted.


Backblaze recommends that you do lots of transfers simultaneously for maximum speed. In tests from my SSD equiped laptop the optimum setting is about --transfers 32 though higher numbers may be used for a slight speed improvement. The optimum number for you may vary depending on your hardware, how big the files are, how much you want to load your computer, etc. The default of --transfers 4 is definitely too low for Backblaze B2 though.