feat: update the module to support automated backup

Author: uchinda-sph

main.tf

@@ -73,6 +73,11 @@ resource "aws_elasticache_replication_group" "this" {
 
   user_group_ids = [var.user_group_id]
 
+  snapshot_retention_limit = var.instance_type != "cache.t1.micro" ? var.snapshot_retention_limit : 0
+  snapshot_window          = var.snapshot_window
+  snapshot_arns            = var.snapshot_arns
+  snapshot_name            = var.snapshot_name
+
   tags = var.tags
 }
 

variables.tf

@@ -248,3 +248,21 @@ variable "user_group_id" {
   description = "The ID of the user group Elasticache"
   default     = ""
 }
+
+variable "snapshot_window" {
+  type        = string
+  description = "The daily time range (in UTC) during which ElastiCache begins taking a daily snapshot of the node group (shard) specified by SnapshottingClusterId"
+  default     = "00:00-01:00"
+}
+
+variable "snapshot_arns" {
+  type        = list(string)
+  description = "The ARN of the snapshot from which to restore data into the new node group (shard)"
+  default     = []
+}
+
+variable "snapshot_name" {
+  type        = string
+  description = "The name of the snapshot from which to restore data into the new node group (shard)"
+  default     = ""
+}