#How do I create a copy of my OS?

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hoary raven
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you can create a identical copy of your entire drive using disks app or dd command.
via disks, look for something related to making a disk image.
via dd
dd if=*your_drive, e.g /dev/sda* of=system.iso

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just make sure you don't mess up if and of, if you type your drive into of (output file) it will wipe your drive clean

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a better way to do this can be using tools like clonezilla which allow you to clone from one drive to another.
if you want a snapshot of your system so that you can rollback incase anything breaks, this can be done via timeshift