LinuxTechi - https://www.linuxtechi.com/install-rear-migration-recovery-tool-centos-7-rhel-7/
ReaR or Relax & Recover is a migration & disaster recovery tool. REAR creates a bootable image for the running Linux machine & when required same bootable image can be used to recover the system. Same image can be used to restore the OS to different hardware as well & hence REAR can also be used as a migration tool. REAR even detects the change of network cards, disk layouts or storage devices i.e. IDE to SCSI or CCISS.
REAR preserves the last condition of the OS including its partition, boot loader configuration, all the system data etc. It