Draft: Relax-and-Recover

Backup to USB and restore from USB

sudo yum install git syslinux syslinux-extlinux kernel-devel

git clone https://github.com/rear/rear.git

cd rear/

insert USB stick to the backed-up computer

lsblk # to find name of the USB flash card

umount /dev/sdb1 # umount if USB flash is automatically mounted

sudo usr/sbin/rear format /dev/sdb

type 'Yes' to format USB flash

rear will format that flash as REAR-000

edit rear configuration:

vi etc/rear/local.conf

### write the rescue initramfs to USB and update the USB bootloader

OUTPUT=USB

### create a backup using the internal NETFS method, using 'tar'

BACKUP=NETFS

### write both rescue image and backup to the device labeled REAR-000

BACKUP_URL=usb:///dev/disk/by-label/REAR-000

Create rescue image  (it's without OS backup and used to restore OS in case of failure) with verbose output:

sudo usr/sbin/rear -v mkrescue
Now reboot your system and try to boot from the USB device. If it's ok, then rescue image is ok and you can do OS data backup alonh with creating rescue media:
sudo usr/sbin/rear -v mkbackup