How to Copy All Files from an Android

[asterose]

I want to access all my files on my android phone (ZTE N817 Legacy) and have downloaded adb.exe and fastload.exe.  Using adb, I can issue a shell command, but when I try to access most of the directories, it gives me a message "Permission denied."  I'm fearful of using fastboot as I'm not familiar with it and know the consequences can sometimes be disastrous.  I merely want to copy the data from my phone.  I used syncdroid for most of it, but it doesn't back up apps, for instance.  Also I want to find out where everything's stored.  Explorer shows practically nothing, and I've combed through every directory several times, and it is set not to hide any files.

[asterose]

I forgot to add I am using Windows 10 on an Acer Aspire E 15 Start laptop.  Also, my phone uses Android 4.4.4.

[Geek-9pm]

Short answer. You will not copy all files because the two operating systems are so unlike each other.
Let somebody else give the long answer.