In this repository, you'll find a few scripts that I've written for my own use. Perhaps one of these scripts will be usefull for you too.
Do you know the size of your website ? How many megabytes/gigabytes ? Do you know how many disk space take all your .zip files ? your images ? Which folder is the biggest one ? All these questions and more will find an answer with the folder_size.php script
kill_folder.php will allow to quickly remove a folder structure i.e. including subfolders by running the script from an URL. This way is MUCH faster than killing a folder from a FTP client which is awfully slow.
show_table.php allows you to extract informations from your Joomla database : run a SQL query and export it as a table. Nice HTML output with Bootstrap and jQuery or a RAW output to only output a <table> tag so the generated table can be easily reuse in, for instance, a spreadsheet program.