Reasons for lost or deleted restore points

  
                  

summary

if there is no available disk space on the system drive or any available non-system drive, then the "System Restore" restore points will clear all monitored partitions in order to free up disk space. If the available disk space on a monitored partition is less than 50 MB, System Restore will also stop monitoring your system and this feature will also be suspended.

Notes
certain software, such as Real Player One utility will delete restore points. This behavior can be viewed in the System Event Viewer log for System Restore events to get volume error events.

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