How to prevent the deletion of files on hosting?

Question

System administration

Hello. An incomprehensible bug got out in one CMS. The point is the following. After certain actions, images are deleted from the folder located on the hosting.

It remains
Either to look for a bug on your own, or simply disable it by deleting files from the folder.

How can I prevent the deletion of files? Maybe special rights to folders.

Tell me please.

Thank you.

Answer 1

Try chattr in your case should help.

Answer 2

you can prevent deletion along with writing to this folder by setting read-only rights
look in the code