Device Backup Differences

You can use the tab Device Backup Differences to identify

Changes of configuration of one switch or router device

Select a device in the list on left pane.
In the upper list of the middle pane select a fist date, in the lower select the second one.
Identified differences will be highlighted and in the bottom pane you can see a summary of detected differences.

Differences in the configuration files of different switches or routers

Select the first device in the list on left pane.
Fix the device by doubleclick on his name in the lower part of middle pain..
Select the second device in the list on left pane.
Select desired time of backups of both devices, identified differency will be highlited.
You can release the device fixed on the lower panel by next doubleclick on its hostname.