Windows 10: Why did my files double in size when I copied them?

Ok, so... I am preparing for the possibility I might have to evacuate due to a natural disaster in my area. Because of this, I thought it might be a good idea to backup my pc in case I need to buy a new one. so I found the largest portable drive I could find (a 2TB WD Elements WDBAAU0020HBK-NESN that I have never used). So, I get it, I reformat it to NTFS and begin copping all 800gb of files in my C: drive. Aside from it taking two days because they were both HHDs and it was happening over USB 2.0, I knowest I almost ran out of room on the HHD. somehow my 800GB of files became nearly 2TB. Does anyone know how this happened and how to make the file size smaller?

Thanks in advance!

submitted by /u/Roman-Tech-Plus
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:)

 

Java.nio.file - Copying files

You can't copy a folder, thats why it generates an exception (you are trying to copy a folder using a copy file function).
You probably need to list all the files inside that folder and copy one by one

 

Java.nio.file - Copying files

Issue was the above, so thanks temp02.

 

C Drive doubled after copying music files to OneDrive!

This is puzzling and frustrating. I moved my 30,000 (approx. 270G) of music files from OneDrive to Music folder recently. Then I decided to keep a copy on OneDrive, so copied them over there. All of a sudden my C Drive shows 607G full, which is about double
what it was before. I can't see any temp files or anything extra that would explain the additional size. My Carbonite app is also showing almost double the number of files backed up. And to make it all even more confusing, my OneDrive only shows 3.42G full
while listing all my music files, which makes no sense. HELP!

I am 70 years old, not as sharp as I used to be although I've used PCs since 1983. I can't understand all the instructions and lingo on support sites anymore. Please help me with simple step-by-step directions if you have a clue what might be going on. Thanks
in advance for kind and helpful replies