The find command only operates on local files. Doing a conditional delete of remote files can't be accomplished - as far as I know - with standard Linux tools. You would normally need a custom program to browse the remote FTP repository, get a list of files older than X days and then issue FTP DELE commands against them. This is a non-trivial piece of code, which should be able to accomplish in about 100 lines of PHP code. You can probably talk to a web developer about it, I believe that any developer with over 6 months of experience should be able to handle it for a very reasonable price.
Nicholas K. Dionysopoulos
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