What is the first software to install on a system, except 7zip? A backup utility that can create a copy of its system once it is installed stably, to be able to copy it, sector by sector, in case of problem, like for example a Windows corruption by a virus or a spyware (it happened to me, it's common, and these malicious software are always more aggressive).

I use PartitionSaving.

This software takes up little space and runs from a disk or a U.S.B. key, which allows it to save any operating system.

When a U.S.B key is used, it must be formatted to be bootable with a FreeDOS operating system. For this, you can use a utility specializing in U.S.B. key formatting like Rufus.

Once formatted, it copies the files needed to run Partition Saving under FreeDOS. In my personal case, I created several partitions on my hard drive. C contains my programs and the operating system. I use an E partition to save them. I also copy the backup to another hard drive. I carefully keep a startup key containing Partition Saving. It's very powerful when I need it, which fortunately does not happen often.

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Restoring the entire system is not always necessary. If you just need to save and restore the registry, use the RegBak freeware. You can download it the tool page.