diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6126eeb3b..a077f74b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,10 +9,14 @@ BUG FIXES:
   * core: Return correct number of planned updates [GH-2620]
   * providers/aws: Allow uppercase characters in `aws_elb.name` [GH-2580]
   * providers/aws: Allow underscores in `aws_db_subnet_group.name` (undocumented by AWS) [GH-2604]
+  * provider/aws: Fix issue with pending Spot Instance requests [GH-2640]
+  * provider/aws: Fix issue in AWS Classic environment with referencing external 
+      Security Groups [GH-2644]
 
 IMPROVEMENTS:
 
   * provider/aws: Create RDS databases from snapshots [GH-2062]
+  * provider/aws: Add support for restoring from Redis backup stored in S3 [GH-2634]
 
 ## 0.6.0 (June 30, 2015)
 
diff --git a/builtin/providers/aws/resource_aws_elasticache_cluster.go b/builtin/providers/aws/resource_aws_elasticache_cluster.go
index fe2139e36..fa0d6b746 100644
--- a/builtin/providers/aws/resource_aws_elasticache_cluster.go
+++ b/builtin/providers/aws/resource_aws_elasticache_cluster.go
@@ -110,6 +110,22 @@ func resourceAwsElasticacheCluster() *schema.Resource {
 				},
 			},
 
+			// A single-element string list containing an Amazon Resource Name (ARN) that
+			// uniquely identifies a Redis RDB snapshot file stored in Amazon S3. The snapshot
+			// file will be used to populate the node group.
+			//
+			// See also:
+			// https://github.com/aws/aws-sdk-go/blob/4862a174f7fc92fb523fc39e68f00b87d91d2c3d/service/elasticache/api.go#L2079
+			"snapshot_arns": &schema.Schema{
+				Type:     schema.TypeSet,
+				Optional: true,
+				ForceNew: true,
+				Elem:     &schema.Schema{Type: schema.TypeString},
+				Set: func(v interface{}) int {
+					return hashcode.String(v.(string))
+				},
+			},
+
 			"tags": tagsSchema(),
 
 			// apply_immediately is used to determine when the update modifications
@@ -163,6 +179,13 @@ func resourceAwsElasticacheClusterCreate(d *schema.ResourceData, meta interface{
 		req.PreferredMaintenanceWindow = aws.String(v.(string))
 	}
 
+	snaps := d.Get("snapshot_arns").(*schema.Set).List()
+	if len(snaps) > 0 {
+		s := expandStringList(snaps)
+		req.SnapshotARNs = s
+		log.Printf("[DEBUG] Restoring Redis cluster from S3 snapshot: %#v", s)
+	}
+
 	_, err := conn.CreateCacheCluster(req)
 	if err != nil {
 		return fmt.Errorf("Error creating Elasticache: %s", err)
diff --git a/builtin/providers/aws/resource_aws_spot_instance_request.go b/builtin/providers/aws/resource_aws_spot_instance_request.go
index d37ef8a34..464a3de0c 100644
--- a/builtin/providers/aws/resource_aws_spot_instance_request.go
+++ b/builtin/providers/aws/resource_aws_spot_instance_request.go
@@ -166,7 +166,10 @@ func resourceAwsSpotInstanceRequestRead(d *schema.ResourceData, meta interface{}
 	}
 
 	d.Set("spot_bid_status", *request.Status.Code)
-	d.Set("spot_instance_id", *request.InstanceID)
+	// Instance ID is not set if the request is still pending
+	if request.InstanceID != nil {
+		d.Set("spot_instance_id", *request.InstanceID)
+	}
 	d.Set("spot_request_state", *request.State)
 	d.Set("tags", tagsToMap(request.Tags))
 
diff --git a/builtin/providers/aws/structure.go b/builtin/providers/aws/structure.go
index d4847de1d..59bc61b14 100644
--- a/builtin/providers/aws/structure.go
+++ b/builtin/providers/aws/structure.go
@@ -157,12 +157,15 @@ func expandIPPerms(
 
 				perm.UserIDGroupPairs[i] = &ec2.UserIDGroupPair{
 					GroupID: aws.String(id),
-					UserID:  aws.String(ownerId),
 				}
+
+				if ownerId != "" {
+					perm.UserIDGroupPairs[i].UserID = aws.String(ownerId)
+				}
+
 				if !vpc {
 					perm.UserIDGroupPairs[i].GroupID = nil
 					perm.UserIDGroupPairs[i].GroupName = aws.String(id)
-					perm.UserIDGroupPairs[i].UserID = nil
 				}
 			}
 		}
diff --git a/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown b/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown
index d6787a143..953b78a9c 100644
--- a/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown
+++ b/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown
@@ -69,6 +69,10 @@ names to associate with this cache cluster
      `false`. See [Amazon ElastiCache Documentation for more information.][1]
      (Available since v0.6.0)
 
+* `snapshot_arns` – (Optional) A single-element string list containing an 
+Amazon Resource Name (ARN) of a Redis RDB snapshot file stored in Amazon S3. 
+Example: `arn:aws:s3:::my_bucket/snapshot1.rdb`
+
 * `tags` - (Optional) A mapping of tags to assign to the resource.