DirCmp

It is not always easy to ensure the contents of two directories are identical, especially if you are not relying on a specialized backup solution to keep all the files synchronized.
DirCmp is a lightweight command-line tool that can help you compare two folders and identify files that are either missing or have been modified. It is relatively easy to use, and it allows you to employ several filters to refine the scan.

Straightforward tool suitable for both novices and experts

Naturally, a program that can only be run from the command console is going to be a bit more challenging for inexperienced users than a GUI-based utility, but this application is far from complex.
A folder comparison job can be launched with a simple command, and the available parameters, along with some helpful explanations, can be listed in the Command Prompt window.

Compare two directories and their subdirectories

Once you have familiarized yourself with the supported parameters, you can compare two folders by simply entering their full paths. However, it is also possible to have the program examine the modification date of each file, as well as hash values.
Additionally, you have the option of including subfolders in the analysis and excluding certain files or folders based on a set of rules that are defined using wildcards.

Generates a detailed report that can be saved to a TXT file

After completing the scan, DirCmp lists all the files that are missing from one of the selected folders or items that are larger or smaller than expected. A brief summary of the results is also included.
The output can be redirected to a text file and saved in the program directory or exported to any other location on your hard drive.
All in all, DirCmp is a useful command-line utility that can help you analyze two folders and identify differences in content. It offers a decent feature set, and it should prove to be very straightforward if you are comfortable using the command console.