
Cleaning folders in a web server is not like cleaning house. You can not just throw everything away. Especially if you’re not sure if the files there are still being used by an application you have not worked on in years.
Always back up your files. Back up your data. Back up your documents. You’ll be grateful for your due diligence when the time comes. A file once lost, may not be recovered - and if you don’t remember how it’s written you’ll be in big trouble. So clean smart - back it all up!