To do this just manually select the files or folders of interest and set a refresh time for the program to run its checks (anything between one minute and one day). Afterwards you'll see a column that constantly displays the current size of each individual file.
All the file columns can be easily exported in CSV format at any time. Likewise, you can convert one of the file's registries to TXT format so you can view its incidents more easily.
Size Matters is a very lightweight application that might prove super useful for users who are running out of space on their hard drives and want to know why.