file server review scope

I was hoping to scope out some useful tests to include as part of an audit / health check of some traditional file servers, which act as team repositories for shared documents/files, and another acts as a home drive server where each employee has a home drive area locked down just to them. I was thinking of basics such as:

access control lists (ACL) - ensure permissions on directories are appropriately restricted and restrict access based upon need to known principles
teams consuming masses of space (poor internal practices)
documents with no recent last access attribute - compare to data retention requirements etc
non-administrators who have full control over shares/directories (should not be the case)
general OS security (e.g patches, local administrators, backups)
general monitoring (e.g. capacity/free space)

can you think of any more areas that would be of benefit in such a review?