[CentOS] How to dump/restore a CentOS 7 system

Hello All,

I guess it is very common for administrative purpose, to dump and restore a CentOS 7 system. I usually use dump/restore commands. However, I’m having trouble to handle installing bootloader and creating initramfs for C7 system. Does anyone know a good document source that details those procedure?
Thank you,

Xinhuan Zheng