backup playbook are not clearning /var/tmp/rear.* but the default path is now /var/tmp which leaves stale files each time a backup is taken. Here's a patch that should fix that :

[dhill@knox backup_and_restore]$ git diff
diff --git a/tripleo_ansible/roles/backup_and_restore/defaults/main.yml b/tripleo_ansible/roles/backup_and_restore/defaults/main.yml
index 5110452b..ebd30b38 100644
— a/tripleo_ansible/roles/backup_and_restore/defaults/main.yml
+++ b/tripleo_ansible/roles/backup_and_restore/defaults/main.yml
@@ -47,7 +47,7 @@ tripleo_backup_and_restore_clients_nets: ['192.168.24.0/24', '10.0.0.0/24', '172
tripleo_backup_and_restore_shared_storage_subfolders: []
tripleo_backup_and_restore_rear_simulate: false
tripleo_backup_and_restore_using_uefi_bootloader: 0
-tripleo_backup_and_restore_exclude_paths_common: ['/data/*', '/tmp/*', '{{ tripleo_backup_and_restore_shared_storage_folder }}/*']
+tripleo_backup_and_restore_exclude_paths_common: ['/data/*', '/tmp/*', '/var/tmp/*', '{{ tripleo_backup_and_restore_shared_storage_folder }}/*']
tripleo_backup_and_restore_exclude_paths_controller_non_bootstrapnode: false
tripleo_backup_and_restore_exclude_paths_controller: ['/var/lib/mysql/*']
tripleo_backup_and_restore_exclude_paths_compute: ['/var/lib/nova/instances/*']
diff --git a/tripleo_ansible/roles/backup_and_restore/tasks/run_backup.yml b/tripleo_ansible/roles/backup_and_restore/tasks/run_backup.yml
index c7ec32a7..51b489ac 100644
— a/tripleo_ansible/roles/backup_and_restore/tasks/run_backup.yml
+++ b/tripleo_ansible/roles/backup_and_restore/tasks/run_backup.yml
@@ -83,6 +83,7 @@
shell: |
set -o pipefail
rm -rf /tmp/rear.* || true
+ rm -rf /var/tmp/rear.* || true
rm -rf /var/lib/rear/output/*
failed_when: false
tags: