CloudFormer can automatically generate a CFT from existing AWS resources in your AWS account. It stores the CFT in a target S3 bucket specified by you. Unlike writing a template from scratch, CloudFormer performs a reverse-engineering task and makes your life easier by generating a template from existing AWS resources in your account. This template can be used as it is for DR, or you can use them for customizing your infrastructure based on your needs. At the time of writing this book, CloudFormer is still in beta version.
More about CloudFormer can be found at https://docs.aws.amazon.com/ AWSCloudFormation/latest/UserGuide/cfn-using-cloudformer.html.