```ruby
require "fog/aws"
require "open-uri"

class PgbackupsArchive::Storage

  def initialize(key, file)
    @key = key
    @file = file
  end

  def connection
    Fog::Storage.new({
      :provider              => "AWS",
      :aws_access_key_id     => ENV["PGBACKUPS_AWS_ACCESS_KEY_ID"],
      :aws_secret_access_key => ENV["PGBACKUPS_AWS_SECRET_ACCESS_KEY"],
      :region                => ENV["PGBACKUPS_REGION"],
      :persistent            => false
    })
  end

  def bucket
    connection.directories.get ENV["PGBACKUPS_BUCKET"]
  end

  def store
    options = { key: @key, body: @file, public: false, encryption: "AES256" }

    if ENV["PGBACKUPS_MULTIPART_CHUNK_SIZE"]
      options.merge!(multipart_chunk_size: ENV["PGBACKUPS_MULTIPART_CHUNK_SIZE"].to_i)
    end

    bucket.files.create(options)
  end

end
```

Convert `:` to `=>` for better Ruby compatibility
user
```ruby
require "fog/aws"
require "open-uri"

class PgbackupsArchive::Storage

  def initialize(key, file)
    @key = key
    @file = file
  end

  def connection
    Fog::Storage.new({
      :provider              => "AWS",
      :aws_access_key_id     => ENV["PGBACKUPS_AWS_ACCESS_KEY_ID"],
      :aws_secret_access_key => ENV["PGBACKUPS_AWS_SECRET_ACCESS_KEY"],
      :region                => ENV["PGBACKUPS_REGION"],
      :persistent            => false
    })
  end

  def bucket
    connection.directories.get ENV["PGBACKUPS_BUCKET"]
  end

  def store
    options = {:key => @key, :body => @file, :public => false, :encryption => "AES256"}

    if ENV["PGBACKUPS_MULTIPART_CHUNK_SIZE"]
      options.merge!(:multipart_chunk_size => ENV["PGBACKUPS_MULTIPART_CHUNK_SIZE"].to_i)
    end

    bucket.files.create(options)
  end

end
```
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