Hello mafu,
I'm sorry to hear you experienced this issue. This kind of data loss is rare to see, though is possible with sudden power loss or hardware failure. This can also happen if you move any files around in the Sighthound Video data directory (
https://www.sighthound.com/support/wher ... store-data)
If you did not knowingly suffer a power outage or something similar, I would highly recommend running a hard drive diagnostic tool and a memory diagnostic tool (such as
http://www.memtest.org/).
If you have a backup of the Sighthound Video data directory we can copy over the "camdb" file and "Rules" folder to restore your camera's and rules.
Regards,
-Devin