It won't "void the warranty" but if you want to preserve everything, use something like Macrium Reflect (free) to create an image which includes all partitions on the drive now and save the image on an external USB drive.  Then use Macrium to create a bootable USB stick that you'll need to restore the image on the HDD. Hint: Test that bootable USB stick to make sure it actually boots the PC now, before you ever need it.  
Just purchased a new Inspiron 3880 for my wife and it is loaded with Dell software - mostly for diagnostics, updates, and recovery.  I also noticed that there are three hidden Dell partitions on the hard disc.  All of the software and partitions are taking up 50 GB on space on the 256 GB NVMe drive. Since I am very proficient with Windows 10 and clean installations, would it be worthwhile to simply do a clean install and do away with all of the Dell bloatware and reformat the drive to remove the hidden partitions?  I can make a USB recovery drive ahead of time in case it would ever be needed.  Does removing all the Dell software and reformatting the hard drive during a clean install void the warranty?
Is it Okay to Remove all Dell Software & Partitions for Recovery