I've created a new Debian VM and installed some basic setup on it, e.g. making user as a sudoer, x11vnc, etc. I want to back it up as my own customized image so that I may need to create another VM like this in the future without having to setup those things again.
What should be the right process to backing up the said vdisk1.img and use it later for creating another VM with different VM name and hostname?
 

Copy the vdisk, you can do a reflink copy if you want to use less space, then just create a new VM and point to it.

Thanks. Will the changes in the new VM also change the original vdisk1?

No, only the copy.

Thanks. I opened Unraid console, created a new folder in domains folder and I used the following command. It didn't work. My cache is brtfs. What I did wrong?

 

That suggests COW is disabled for that share, that was old Unraid default.

My cache drive COW is set to Auto.  Is it supposed to allow me to cp --reflink?

Edited December 13, 20223 yr by bthoven

Shares -> Domains -> "Enable Copy-on-write" check if it's "Off"

It is No. I understand that I can't simply change it to Yes?

Edited December 13, 20223 yr by bthoven

Nope, you'll need to create a regular copy.