Pages, Parts and Templates:

Version 6.45 and lower:  Parts, pages, and templates cannot be individually restored. The only way to restore one of these items is to restore the entire NetCommunity database to a point in time when the affected items are known to have existed as-desired. Blackbaud also highly advises that if a restore of a NetCommunity website is performed, that the Raiser's Edge and Education Edge (if used) databases also be restored to matching points in time to ensure data integrity.

Version 6.45 and above: Parts, pages, and templates can be individually restored in NetCommunity under Site Explorer. 
  1. Select either Pages and Templates or Parts.
  2. Click the Deleted Parts or Deleted Pages/Templates folder under the Folders tab. 
  3. Mark the checkbox in the Action column for the row that corresponds to the Page, Template, or Part that you wish to restore.
  4. Click Restore.

Layouts:

As site layouts are designed directly using HTML, it may be possible to access a backup of the NetCommunity database without actually restoring it to the live site and extract the saved HTML that was used in the design of the affected site layout.

If your NetCommunity site is hosted by Blackbaud: Click Chat with Support and reference this article