It's not really about the amount of backup history as it is the process of creating "timeline" objects.
The best advice I give customers is to disable the timeline - that will leave you with the backup history, but the graphical display showing the times backups are predicted to run will not be populated.
You can create the registry key (the final bit should be a DWORD)
HKLM\Software\Wow6432Node\Red Gate\SQLBackup\Client\DisableTimelineItemRequests
and setting the value to "1"
The best advice I give customers is to disable the timeline - that will leave you with the backup history, but the graphical display showing the times backups are predicted to run will not be populated.
You can create the registry key (the final bit should be a DWORD)
HKLM\Software\Wow6432Node\Red Gate\SQLBackup\Client\DisableTimelineItemRequests
and setting the value to "1"