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Your laptop runs out of capacity but  you dont want to backup your hdd with the new one?
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here some tips for you but this method only works with optical drive laptop only or usually called DVD ROM and it never useful for you
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First, you must have the hdd caddy or second hdd,you can buy it in amazon .
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https://www.amazon.com/ZXUY-Unibody-Laptop-DVD-ROM-Replacement/dp/B0058AH2US/ref=sr_1_3?ie=UTF8&qid=1517064330&sr=8-3&keywords=hdd+caddy
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and also of course you must have HDD or SSD Sata slot only,the size is up to you.
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Second,you have to open some screws to open hatch,and to remove the optical drive
the way to open it is variety depends on what laptop do you have . Here the video for more explanation. 
https://www.youtube.com/watch?v=Ql4jmIOFb7c
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Yes,that's all stay follow me for more technology tips and tricks .
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Thank You ^_^
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