aws-backup

This component is responsible for provisioning an AWS Backup Plan. It creates a schedule for backing up given ARNs.

Usage

Stack Level: Regional

Here's an example snippet for how to use this component.

Component Abstraction and Separation

By separating the "common" settings from the component, we can first provision the IAM Role and AWS Backup Vault to prepare resources for future use without incuring cost.

For example, stacks/catalog/aws-backup/common:

# This configuration creates the AWS Backup Vault and IAM Role, and does not incur any cost on its own.
# See: https://aws.amazon.com/backup/pricing/
components:
  terraform:
    aws-backup:
      metadata:
        type: abstract
      settings:
        spacelift:
          workspace_enabled: true
      vars: {}

    aws-backup/common:
      metadata:
        component: aws-backup
        inherits:
          - aws-backup
      vars:
        enabled: true
        iam_role_enabled: true # this will be reused
        vault_enabled: true # this will be reused
        plan_enabled: false
## Please be careful when enabling backup_vault_lock_configuration,
#        backup_vault_lock_configuration:
##         `changeable_for_days` enables compliance mode and once the lock is set, the retention policy cannot be changed unless through account deletion!
#          changeable_for_days: 36500
#          max_retention_days: 365
#          min_retention_days: 1

Then if we would like to deploy the component into a given stacks we can import the following to deploy our backup plans.

Since most of these values are shared and common, we can put them in a catalog/aws-backup/ yaml file and share them across environments.

This makes deploying the same configuration to multiple environments easy.

stacks/catalog/aws-backup/defaults:

import:
  - catalog/aws-backup/common

components:
  terraform:
    aws-backup/plan-defaults:
      metadata:
        component: aws-backup
        type: abstract
      settings:
        spacelift:
          workspace_enabled: true
        depends_on:
          - aws-backup/common
      vars:
        enabled: true
        iam_role_enabled: false # reuse from aws-backup-vault
        vault_enabled: false # reuse from aws-backup-vault
        plan_enabled: true
        plan_name_suffix: aws-backup-defaults

    aws-backup/daily-plan:
      metadata:
        component: aws-backup
        inherits:
          - aws-backup/plan-defaults
      vars:
        plan_name_suffix: aws-backup-daily
        # https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html
        rules:
          - name: "plan-daily"
            schedule: "cron(0 5 ? * * *)"
            start_window: 320 # 60 * 8             # minutes
            completion_window: 10080 # 60 * 24 * 7 # minutes
            lifecycle:
              delete_after: 35 # 7 * 5               # days
        selection_tags:
          - type: STRINGEQUALS
            key: aws-backup/efs
            value: daily
          - type: STRINGEQUALS
            key: aws-backup/rds
            value: daily

    aws-backup/weekly-plan:
      metadata:
        component: aws-backup
        inherits:
          - aws-backup/plan-defaults
      vars:
        plan_name_suffix: aws-backup-weekly
        # https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html
        rules:
          - name: "plan-weekly"
            schedule: "cron(0 5 ? * SAT *)"
            start_window: 320 # 60 * 8              # minutes
            completion_window: 10080 # 60 * 24 * 7  # minutes
            lifecycle:
              delete_after: 90 # 30 * 3               # days
        selection_tags:
          - type: STRINGEQUALS
            key: aws-backup/efs
            value: weekly
          - type: STRINGEQUALS
            key: aws-backup/rds
            value: weekly

    aws-backup/monthly-plan:
      metadata:
        component: aws-backup
        inherits:
          - aws-backup/plan-defaults
      vars:
        plan_name_suffix: aws-backup-monthly
        # https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html
        rules:
          - name: "plan-monthly"
            schedule: "cron(0 5 1 * ? *)"
            start_window: 320 # 60 * 8              # minutes
            completion_window: 10080 # 60 * 24 * 7  # minutes
            lifecycle:
              delete_after: 2555 # 365 * 7            # days
              cold_storage_after: 90 # 30 * 3         # days
        selection_tags:
          - type: STRINGEQUALS
            key: aws-backup/efs
            value: monthly
          - type: STRINGEQUALS
            key: aws-backup/rds
            value: monthly

Deploying to a new stack (environment) then only requires:

import:
  - catalog/aws-backup/defaults

The above configuration can be used to deploy a new backup to a new region.

Adding Resources to the Backup - Adding Tags

Once an aws-backup with a plan and selection_tags has been established we can begin adding resources for it to backup by using the tagging method.

This only requires that we add tags to the resources we wish to backup, which can be done with the following snippet:

components:
  terraform:
    <my-resource>
      vars:
        tags:
          aws-backup/resource_schedule: "daily-14day-backup"

Just ensure the tag key-value pair matches what was added to your backup plan and aws will take care of the rest.

Copying across regions

If we want to create a backup vault in another region that we can copy to, then we need to create another vault, and then specify that we want to copy to it.

To create a vault in a region simply:

components:
  terraform:
    aws-backup:
      vars:
        plan_enabled: false # disables the plan (which schedules resource backups)

This will output an ARN - which you can then use as the destination in the rule object's copy_action (it will be specific to that particular plan), as seen in the following snippet:

components:
  terraform:
    aws-backup/plan-with-cross-region-replication:
      metadata:
        component: aws-backup
        inherits:
          - aws-backup/plan-defaults
      vars:
        plan_name_suffix: aws-backup-cross-region
        # https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html
        rules:
          - name: "plan-cross-region"
            schedule: "cron(0 5 ? * * *)"
            start_window: 320 # 60 * 8             # minutes
            completion_window: 10080 # 60 * 24 * 7 # minutes
            lifecycle:
              delete_after: 35 # 7 * 5               # days
            copy_action:
              destination_vault_arn: "arn:aws:backup:<other-region>:111111111111:backup-vault:<namespace>-<other-region>-<stage>"
              lifecycle:
                delete_after: 35

Backup Lock Configuration

To enable backup lock configuration, you can use the following snippet:

AWS Backup Vault Lock

Compliance Mode

Vaults locked in compliance mode cannot be deleted once the cooling-off period ("grace time") expires. During grace time, you can still remove the vault lock and change the lock configuration.

To enable Compliance Mode, set changeable_for_days to a value greater than 0. Once the lock is set, the retention policy cannot be changed unless through account deletion!

# Please be careful when enabling backup_vault_lock_configuration,
backup_vault_lock_configuration:
  #         `changeable_for_days` enables compliance mode and once the lock is set, the retention policy cannot be changed unless through account deletion!
  changeable_for_days: 36500
  max_retention_days: 365
  min_retention_days: 1

Governance Mode

Vaults locked in governance mode can have the lock removed by users with sufficient IAM permissions.

To enable governance mode

backup_vault_lock_configuration:
  max_retention_days: 365
  min_retention_days: 1

Variables

Required Variables

region (string) required: AWS Region

Optional Variables

advanced_backup_setting optional

An object that specifies backup options for each resource type.

Type:

object({
backup_options = string
resource_type  = string
})

Default value: null

backup_resources (list(string)) optional

An array of strings that either contain Amazon Resource Names (ARNs) or match patterns of resources to assign to a backup plan

Default value: [ ]

backup_vault_lock_configuration optional

The backup vault lock configuration, each vault can have one vault lock in place. This will enable Backup Vault Lock on an AWS Backup vault it prevents the deletion of backup data for the specified retention period. During this time, the backup data remains immutable and cannot be deleted or modified."
changeable_for_days - The number of days before the lock date. If omitted creates a vault lock in governance mode, otherwise it will create a vault lock in compliance mode.

Type:

object({
changeable_for_days = optional(number)
max_retention_days  = optional(number)
min_retention_days  = optional(number)
})

Default value: null

iam_role_enabled (bool) optional

Whether or not to create a new IAM Role and Policy Attachment

Default value: true

kms_key_arn (string) optional

The server-side encryption key that is used to protect your backups

Default value: null

plan_enabled (bool) optional

Whether or not to create a new Plan

Default value: true

plan_name_suffix (string) optional

The string appended to the plan name

Default value: null

rules optional

An array of rule maps used to define schedules in a backup plan

Type:

list(object({
name                     = string
schedule                 = optional(string)
enable_continuous_backup = optional(bool)
start_window             = optional(number)
completion_window        = optional(number)
lifecycle = optional(object({
  cold_storage_after                        = optional(number)
  delete_after                              = optional(number)
  opt_in_to_archive_for_supported_resources = optional(bool)
}))
copy_action = optional(object({
  destination_vault_arn = optional(string)
  lifecycle = optional(object({
    cold_storage_after                        = optional(number)
    delete_after                              = optional(number)
    opt_in_to_archive_for_supported_resources = optional(bool)
  }))
}))
}))

Default value: [ ]

selection_tags (list(map(string))) optional

An array of tag condition objects used to filter resources based on tags for assigning to a backup plan

Default value: [ ]

vault_enabled (bool) optional

Whether or not a new Vault should be created

Default value: true

Context Variables

The following variables are defined in the context.tf file of this module and part of the terraform-null-label pattern.

additional_tag_map (map(string)) optional

Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration.

Required: No

Default value: { }

attributes (list(string)) optional

ID element. Additional attributes (e.g. workers or cluster) to add to id,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the delimiter
and treated as a single ID element.

Required: No

Default value: [ ]

context (any) optional

Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as null to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional_tag_map, which are merged.

Required: No

Default value:

{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "descriptor_formats": {},
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "labels_as_tags": [
    "unset"
  ],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {},
  "tenant": null
}

delimiter (string) optional

Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.

Required: No

Default value: null

descriptor_formats (any) optional

Describe additional descriptors to be output in the descriptors output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
\{<br/> format = string<br/> labels = list(string)<br/> \}
(Type is any so the map values can later be enhanced to provide additional options.)
format is a Terraform format string to be passed to the format() function.
labels is a list of labels, in order, to pass to format() function.
Label values will be normalized before being passed to format() so they will be
identical to how they appear in id.
Default is {} (descriptors output will be empty).

Required: No

Default value: { }

enabled (bool) optional

Set to false to prevent the module from creating any resources
Required: No

Default value: null

environment (string) optional

ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'
Required: No

Default value: null

id_length_limit (number) optional

Limit id to this many characters (minimum 6).
Set to 0 for unlimited length.
Set to null for keep the existing setting, which defaults to 0.
Does not affect id_full.

Required: No

Default value: null

label_key_case (string) optional

Controls the letter case of the tags keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the tags input.
Possible values: lower, title, upper.
Default value: title.

Required: No

Default value: null

label_order (list(string)) optional

The order in which the labels (ID elements) appear in the id.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.

Required: No

Default value: null

label_value_case (string) optional

Controls the letter case of ID elements (labels) as included in id,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the tags input.
Possible values: lower, title, upper and none (no transformation).
Set this to title and set delimiter to "" to yield Pascal Case IDs.
Default value: lower.

Required: No

Default value: null

labels_as_tags (set(string)) optional

Set of labels (ID elements) to include as tags in the tags output.
Default is to include all labels.
Tags with empty values will not be included in the tags output.
Set to [] to suppress all generated tags.
Notes:
The value of the name tag, if included, will be the id, not the name.
Unlike other null-label inputs, the initial setting of labels_as_tags cannot be
changed in later chained modules. Attempts to change it will be silently ignored.

Required: No

Default value:

[
  "default"
]

name (string) optional

ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a tag.
The "name" tag is set to the full id string. There is no tag with the value of the name input.

Required: No

Default value: null

namespace (string) optional

ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique
Required: No

Default value: null

regex_replace_chars (string) optional

Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.

Required: No

Default value: null

stage (string) optional

ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'
Required: No

Default value: null

tags (map(string)) optional

Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.

Required: No

Default value: { }

tenant (string) optional

ID element (Rarely used, not included by default). A customer identifier, indicating who this instance of a resource is for
Required: No

Default value: null

Outputs

backup_plan_arn: Backup Plan ARN
backup_plan_version: Unique, randomly generated, Unicode, UTF-8 encoded string that serves as the version ID of the backup plan
backup_selection_id: Backup Selection ID
backup_vault_arn: Backup Vault ARN
backup_vault_id: Backup Vault ID

Dependencies

Requirements

terraform, version: >= 1.3.0
aws, version: >= 4.9.0

Modules

Name	Version	Source	Description
`backup`	1.0.0	`cloudposse/backup/aws`	n/a
`iam_roles`	latest	`../account-map/modules/iam-roles`	n/a
`this`	0.25.0	`cloudposse/label/null`	n/a

References

cloudposse/terraform-aws-components - Cloud Posse's upstream component

How to Enable Cross-Region Backups in AWS-Backup

Usage​

Component Abstraction and Separation​

Adding Resources to the Backup - Adding Tags​

Copying across regions​

Backup Lock Configuration​

Compliance Mode​

Governance Mode​

Variables​

Required Variables​

Optional Variables​

Context Variables​

Outputs​

Dependencies​

Requirements​

Modules​

References​

Related How-to Guides​

Usage

Component Abstraction and Separation

Adding Resources to the Backup - Adding Tags

Copying across regions

Backup Lock Configuration

Compliance Mode

Governance Mode

Variables

Required Variables

Optional Variables

Context Variables

Outputs

Dependencies

Requirements

Modules

References

Related How-to Guides