How to set up remote boot OS selection?

Question

linux

I have an old home PC. Serves for server experiments and as a file dump.
I use OpenMediaVault (debian based). Also configured are samba, ftp, mysql, nginx, and ownCloud.
Unsuccessful experiments (the web-GUI fell, followed by the server) showed the need for backups of the OS itself. But they need to be made from the external environment. I would also like to install the OS remotely, otherwise twisting 2 computers is not an effective solution.
The question arose: how to make a remote OS boot selection and remote installation.
Configuration: HDD 160 Gb. (The only one and do not plan to expand).
CPU: Intel Atom 230 1.6 GHz, HT, no virtualization.
RAM: 1 Gb.

Answer 1

1) set the BIOS to boot over the network first.
2) google on the PXE account
3) google unattended install scripts of your favorite OS.
on day D and hour H turn on the PXE server + restart the target computer = silent reinstallation of the OS on the target system

Answer 2

And use LXC containers (you have already been written about PXE network boot). Containers do not require virtualization, but profit as from full-fledged virtual machines.