> For the complete documentation index, see [llms.txt](https://docs.duplicati.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.duplicati.com/backup-destinations/provider-specific-destinations/backblaze-b2-destination.md).
# Backblaze B2 Destination
Duplicati supports storing files with Backblaze B2, which is a large-scale object storage, similar to S3. With B2 you store "objects" (similar to files) in "buckets" which define various properties shared between the objects. If you use a `/` in the object prefix, they can be displayed as virtual folders when listing them.
## User interface
To configure the B2 destination you must supply: bucket, path in bucket, application id, and application key.
If you use the "Test connection" button and the bucket does not exist, Duplicati will offer to create the bucket for you.
## URL format for Commandline
To use the B2 storage destination, use the following URL format:
```
b2:///
?b2-accountid=
&b2-applicationkey=
```
## Create a bucket
You can use the Backblaze UI to create your buckets, but if you need to create buckets with Duplicati, this is also possible. The default is to create private buckets, but you can create public buckets with `--b2-create-bucket-type=allPublic`.
## Performance tuning
You can change the size of file listings to better match pricing and speed through `--b2-page-size`, which is default set to 500, meaning you will have a list request for each 500 objects. Note that setting this higher may cause the number of requests to go down, but each requests may be priced as a more expensive request.
If you prefer downloads from you custom domain name, you can supply this with `--b2-download-url`. This setting does not affect uploads.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.duplicati.com/backup-destinations/provider-specific-destinations/backblaze-b2-destination.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.