File storage and access php/sql script rewrite

We had a script written for us a few years ago. We now need it to be totally updated, but maintain the original data and user database. The script is a file archive plus membership access system written in PHP + MySQL. The simple basis of the script is that: Users signup or get added by the Admins or Sub-Admins. The Admins or Sub-Admins decide which "Group" each User belongs to. The Admins create folders and sub-folders for file archiving. The Admins decide which "Group" of Users can access which folders and sub-folders. Depending on the folder setting and access permission, Users can download and/or upload files. We now require: Refresh of the above script and the ability to use it on multiple ip addressed servers. The current script prevents this and hence the need for a TOTAL rewrite. We use a server which has 4 different ip addresses applied to it and hence the issue. Currently we are using a 3rd party web server and would like to move it onto our in house servers. An additional feature to scavenge files which have not been accessed in a set time frame and move them to a compressed archive on a different server. (by FTP) An additional feature to export files and folders or even folder trees with their files by FTP. More flexibiity to what functions sub admins can see. eg would be useful for them to be able to see the logs. ? ## Deliverables All information contained within the site and the relevant databases is confidential and may not be disclosed or used outside this project.