I am doing this on my personal computer, which has many files. Henceforth i don't want any file loss 
What I meant is to delete the Ubuntu root directory and assign that space for Zorin's root directory.
I thought that process might simplify things.
Welcome to the community @Gekkouga. I wanted to do the exact opposite of which you are asking 
, except removing Zorin.
You can follow my advice above regarding making a back up of the entire Home folder and Rescuezilla image backup before initiating making a big move.
Rescuezilla seems difficult 
, or else they have not mentioned the steps in an easy manner
While no one will stop you to do your experiment, I do not think it is workable.
And will Rescuezilla back up all my files and stuff
It will.
But it can only restore the disk as a whole image.
It is not possible to pick and chose what you want to restore.
It is works like a Time-machine in macOS to revert back to how things were before the any changes made.
hmm... so for example if i backup there and if i want to restore it, then what will be its process
I am in a hurry just because i wanted to use Ubuntu with GNOME 40
You should check the Rescuezilla site I gave above.
There is a good tutorial which I see no point for me to repeat here.
Oh thank you so much. One last thing, after installing ubuntu in another partition, will it's grub clash with zorin os' grub
"Hurry" is a main ingredient of a recipe for disaster.
Take your time and try to understand the whole procedure before jumping into making any major changes unless you are under the gun point (and I assume you are not).
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Yup of course not 
Hi, welcome.
No, it is not possible to replace Ubuntu with Zorin and keep everything from data (/) .
You can backup data and specific folder only.
If you have Ubuntu on 2 separate partition, root on one and home on second, than you can use those "home" partition on Zorin
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Then, off to the Rescuezilla and read and study.
It is a stand alone software and you need to create a bootable USB to use it. Whole procedure is in GUI and beginner friendly.
In fact, I made a Rescuezilla USBs and gave them as a Christmas gift for my husband in addition to his daughter. The super penguin is absolutely cute!
Alright, thanks.
I do not want to risk my data. I'll just follow backup and restore.
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This will help future visitors to this forum to find a solution they are looking for.
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