Use new backup removal policy

infrastructure/docker-backup/image/Dockerfile

@@ -1,4 +1,4 @@
-FROM domaindrivenarchitecture/dda-backup
+FROM domaindrivenarchitecture/dda-backup:1.0.4
 
 # Prepare Entrypoint Script
 ADD resources /tmp

infrastructure/docker-backup/image/resources/backup.sh

@@ -5,7 +5,8 @@ set -o pipefail
 function main() {
     file_env AWS_ACCESS_KEY_ID
     file_env AWS_SECRET_ACCESS_KEY
-    file_env RESTIC_DAYS_TO_KEEP 14
+    file_env RESTIC_DAYS_TO_KEEP 30
+    file_env RESTIC_MONTHS_TO_KEEP 12
 
     backup-fs-from-directory '/var/backups/' 'export/'
 }