Yes I have 3 USB ports
Well, you have 2 ports for 2 usb's.
Perhaps you still have the iso file already installed on a pendrive. With this one you can boot the OS (also for installation). If not you will have to write the iso to the usb, but I guess you have done this before.
First and then reach for the file(s) you want to keep by copying them to the second usb.
When done backing up/copying, you can install the OS again. Behold, this will overwrite your previous installation and data if you choose to format and install to the SSD/HDD.
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I have 2 pen drives now, one with 8 GB storage and another with 32 GB storage. And I have used 300 GB in my laptop hard drive. Can I do that back up in that 32 GB Pendrive?
Is that possible?
Well, if you do the math 300GB will not fit on 32GB. 
Do you want to backup the total 300GB, or just the useful and personal data?. You will have to decide which to keep and which to override.
The apps and Zorin installation can be replaced. If the data which you want to keep is larger then 32GB, you will have to find a different solution, perhaps by taking the drive out of the computer and try to rescue your personal files with a different computer by attaching the 300GB as a usb drive.
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I know that
But what kind of backup you are talking about.
One with making a system image
or copying all the necessary data to the pen drive?
No, not the system image because, you want to reinstall that one.
Exactly I mean the useful and personal data (necessary) you want to keep/back up. Usually these are kept in the home folder.
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Everything is important to me. 200 GB data from 300 GB data is important for me.
Is there any way to do that?
Ok, then you will have to backup a different way. Have you done it before?
There are different ways to do it.
- using a second computer
- resizing the one already present and copying your data to a second partition
- Or using a bigger external HDD.
But can you boot up the Zorin iso and provide us a print screen of the drive which is present in the computer right now.
You can do this with the Gparted app.
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Okay.
Screenshot of GParted
Hello sir, I am sorry to forget that I have used only 148 GB on this pc. By mistakenly I have told you about the harddisk in my another PC 
No worries there my good friend. You're doing perfect.
Just as I thought you have enough space to use as a backup.
You can use gparted to create a separate partition of 200GB.
After this you can startup the file manager, so you can manage your backup data. Copy the files you want to keep to the newly created partition.
When done you can start the installation and make sure you install the system to the first partition which already has Zorin.
You will have to format this and install the system once again.
Hope I am clear enough?
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Here in this trial mode, the date is correct but the time is not correct. It's now 10: 16 am but it is showing the time as 4:45 pm
Okay, sir, I have created the partition but can I backup my apps and restore them after the full installation with this process??
I'm afraid not. Most of the apps are installed with the system and have dependencies. So when you back them up they won't work properly.
Are there apps which you want to keep because most of them can be installed from the Software store or by using synaptic.
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I have a lot of outside applications installed in my previous os. And I have downloaded most of them from the internet. Some apps are very hard to install. I have a limited one-day data pack to 2 GB so again installing those apps will take around the time of a whole month or more than that. Installing all that apps again will be a very big pain for me.
Is there any way to backup apps?
(I think you can understand my problem.)
Can I ask if the limited data pack of 2GB isn't the cause of the wifi problem?
Second, are these Linux apps? And I do understand your problem.
But still you will have to make a decision, whether you want to try recover the previous installed OS, which will be rather complicated, seeing the previous attempts you made with the other volunteers or reinstall the OS but have a loss of the already installed apps.
Yes, reinstalling will be difficult for you, expecially with the limited data pack.
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Sorry sir, I don't get your question.
The limited data pack of 2GB is from your internet provider, right?
So this morning you started a new data pack of 2 GB?
(perhaps that's not the problem, just a thought)
Still you will have to make a decision whether to proceed and tackle the wifi problem on the existing OS or backup your data, loose the apps an reinstall the system. But backing up your data is always ok but you will have to decide what to keep.
I'm afraid I will have to cut loose because it been a late night for me its past 6:30 am here and I have to catch some sleep.
You think it over, what to backup and hopefully the other volunteers will try to help you further.
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Okay, Thank you very much, sir. Have a sweet dream