I often use an ArcMap mxd for reference. Sometimes, these mxds gets corrupted in such a way that all map features are removed from the project. If viewing the table of contents using "list by source", all tabular data is still listed and available for use. This has happened to several projects over the past 10 or so years using various versions of ArcGIS Desktop. It is very frustrating!
Other than backing up my projects, how can I avoid this happening again? Can these projects be repaired?