AutoCAD and SharePoint Integration
Using Edit Any Document for SharePoint you can open AutoCAD DWG files from SharePoint documents library web page, without downloading or synchronizing. After editing the file you can save it back directly to SharePoint server just using standard Save menu in AutoCAD. To initiate the edit select "Edit Document" in document library context menu.
AutoCAD creates a backup file (.bak), that has the same name as original .dwg file in the folder where the .dwg is located. Because by default SharePoint does not display document extension this may cause a confusion. As a workaround typically you either show "Name (for use in forms)" column or will disable backups in AutoCAD. To disable backups go to Options -> Open and Save tab. Uncheck the 'Create backup copy with each save' check-box.