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docs: Recommend to setup B2 versions lifecycle rules

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@ -463,9 +463,11 @@ Backblaze B2
than using the Backblaze B2 backend directly.
Different from the B2 backend, restic's S3 backend will only hide no longer
necessary files. Thus, make sure to setup lifecycle rules to eventually
delete hidden files. The lifecycle setting "Keep only the last version of the file"
will keep only the most current version of a file. Read the [Backblaze documentation](https://www.backblaze.com/docs/cloud-storage-lifecycle-rules).
necessary files. By default, Backblaze B2 retains all of the different versions of the
files and "hides" the older versions. Thus, to make sure to setup B2 lifecycle rules to
delete hidden files, the B2 lifecycle setting "Keep only the last version of the file"
is **recommended**. The previous version of the file is "hidden" for one day and then
deleted automatically by B2. More details at the [Backblaze documentation](https://www.backblaze.com/docs/cloud-storage-lifecycle-rules).
Restic can backup data to any Backblaze B2 bucket. You need to first setup the
following environment variables with the credentials you can find in the