It depends on the kind of backup you are looking for.
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When it comes to backing up an S3 bucket, you should use "Storage Replication", which allows you to synchronize your bucket to another one (cross-provider).

This means that all your buckets will be mirrored, to another bucket on schedule.

This is not considered a "backup" in the sense that we don't store any archives, instead, it's a 1-to-1 copy of your bucket at a given time.

Note: The whole bucket can be synced if you use / as the source storage path.