In File Explorer, when I copy pictures from my mobile phone to my PC, this is normally done through copying and pasting the files into one sub-folder, for example, MY PICTURES (FOLDER) > 2024 (SUBFOLDER) with the remainder of the conflicts i.e. duplicate files which I choose not to copy as shown in my attached screenshot:

In another project, I made a backup of my data by copying folders and files into another external HDD.
A sample structure is:
My Files (FOLDER) > My Documents (SUBFOLDER) > Bank Statements (SUBFOLDER) > Individual Files...
My Files (FOLDER) > My Documents (SUBFOLDER) > Creditors (SUBFOLDER) > Individual Files...
My Files (FOLDER) > My Documents (SUBFOLDER) > Debtors (SUBFOLDER) > Individual Files...
etc.
When I try to copy for example the separate folders like Bank Statements (SUBFOLDER) and Creditors (SUBFOLDER) and Debtors (SUBFOLDER) in one go, I always hope that Windows will only copy the new individual files and not duplicate any existing files or even subfolders. Is this correct? It seems quite hard to monitor this.
I sometimes put the subfolders in 'Date modified' order to see from when I should add new subfolders or files, so I don't have to copy and paste all of them, but I still don't know if this is correct.
Yesterday I had 1TB of videos to copy to an existing copy of the original folder but I am still not sure if Windows overwrote some of the existing folders and files or if it just added changed files...

In another project, I made a backup of my data by copying folders and files into another external HDD.
A sample structure is:
My Files (FOLDER) > My Documents (SUBFOLDER) > Bank Statements (SUBFOLDER) > Individual Files...
My Files (FOLDER) > My Documents (SUBFOLDER) > Creditors (SUBFOLDER) > Individual Files...
My Files (FOLDER) > My Documents (SUBFOLDER) > Debtors (SUBFOLDER) > Individual Files...
etc.
When I try to copy for example the separate folders like Bank Statements (SUBFOLDER) and Creditors (SUBFOLDER) and Debtors (SUBFOLDER) in one go, I always hope that Windows will only copy the new individual files and not duplicate any existing files or even subfolders. Is this correct? It seems quite hard to monitor this.
I sometimes put the subfolders in 'Date modified' order to see from when I should add new subfolders or files, so I don't have to copy and paste all of them, but I still don't know if this is correct.
Yesterday I had 1TB of videos to copy to an existing copy of the original folder but I am still not sure if Windows overwrote some of the existing folders and files or if it just added changed files...
- Windows Build/Version
- Windows 11 23H2
My Computers
System One System Two
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- OS
- Windows 11 Pro
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- Operating System
- Windows 10 Pro