Hello Michael.
Do you happen to know if the devices causing this issue is possibly a third party device?
You can check to see if you have any third party devices in the option: Reports -> Managed Devices. Look at the "Vendor Name" column.
As far as the backup option, this is located under: Administration -> Backup.
However, because of the various problems you seem to have encountered, I would suggest to rather than performing the "full" backup, you simply backup the essential data; device credentials and currently managed devices.
Then only restore those onto the second collector.
To obtain the list of managed devices, click on Reports -> Managed Devices. Then click on the blue arrow to the right of the search box, select CSV format for simplicity. On your other collector you can run a discovery of known IP addresses, copying and pasting the IPs from the exported file.
Finally, use the export/import feature in the option: Settings -> Device Credentials to backup/restore them from collector to collector. For this I recommend the Pari Device Credentials Repository (.xml) format.
Regards,
Cesar
