• rear version (/usr/sbin/rear -V):
  rear-1.17.2-1.el7.noarch
• OS version (cat /etc/rear/os.conf or lsb_release -a):
  RHEL-7
• rear configuration files (cat /etc/rear/site.conf or cat /etc/rear/local.conf):

[root@rearclient ~]# cat /etc/rear/local.conf
OUTPUT=ISO
OUTPUT_URL=cifs://192.168.122.129/rear
OUTPUT_OPTIONS="cred=/etc/rear/.cifs"
BACKUP=NETFS
BACKUP_URL=cifs://192.168.122.129/rear
BACKUP_OPTIONS="cred=/etc/rear/.cifs"

[root@rearclient ~]# cat /etc/rear/.cifs
username=root 
password=root

• Brief description of the issue:

Rescue image does not contain cifs credentials file specified during image & backup creation which causes an error during the backup restoration procedure. Even though this file can be manually recreated in rear's rescue shell, you should consider adding it to the final rescue image, especially when it is explicitly mentioned in the man page under BACKUP_URL=cifs:// section.