How can I keep the files uploaded by filefield module even though users delete them on node edit form? On my site users can upload photos by using CCK image field.  However I would like to keep the  images uploaded by users on the server even though users delete them on node edit form.

I'm not sure if this is possible or not..  Or backing up the images frequently is the only way?
I used a module called Filefield Sources together with IMCE. And on the file field's configuration page, I enabled the "IMCE Browser" option for additional sources.

I did a few tests and any files attached to a node using the "IMCE Browser" method doesn't get deleted when the file is removed from a node on node edit screen. But files added through the normal "Upload" method do get deleted, so I think you should upload files using the IMCE Browser too as it has a file uploader as well.

I'm not sure how to remove or hide the actual default "Upload" method on the file field though.