Ruuttu

You can enable BuddyPress groups to have their own private little file repositories. Files can 
be uploaded and downloaded and that’s it. There’s no tagging, searching or even pagination.

BuddyPress Group Folders

Very basic and private file storage for groups.

Andrew Stewart

Permissions & Security Audit is a plugin that runs a series of tests to check common security issues with the following areas:
<ul>
<li>File and folder permissions</li>
<li>File and folder ownership</li>
<li>WordPress configuration settings</li>
<li>Apache/PHP and hosting settings</li>
</ul>
Although this plugin will flag potential issues; it will not resolve these items. You will need to manually resolve them, use the help of a plugin or contact an individual who has the experience to help.
Ce plugin est disponible en français aussi.

Permissions & Security Audit

Permissions & Security Audit is a plugin that runs a series of tests to check common security issues with the following areas:

BuddyPress Group Folders vs Permissions & Security Audit