Delenda lets you purge the contents of a defined set of folders. It can remove the contents of sub-folders using the file modification date or the file creation date. There is an option to delete all files of a folder if and only if all the files are obsolete (i.e. no files are deleted if there exists a file which is not obsolete). With Delenda you can set the daily hour of the purge and set the 'keep time' for each folder; for example, you can erase files older than 24 hours in a folder, older than 48 hours in a second folder, etc.