'How to take a snapshot in Qemu?

I have tinyCore and qemu app. When I end my work with qemu, all informations are deleted. I would like to save, what I did, for example files / directories, which I created.

I know that I have to take a snapshot. I watched on youtube "QEMU #8: How to create snapshots", but I don't understand it.

I have qemu.exe application and tinyCore.iso file. I see in this movie, that author have a command like:

qemu-system-x86_64
(...)
-cdrom win10.iso
-hda vm1.img

What is vm1.img? How to create it? This is a copy of iso system file?

qemu

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'How to take a snapshot in Qemu?

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