Error messages during backup after upgrade to TFS 2015 RC

I upgraded our TFS 2013.4 server to 2015 RC a couple of weeks ago and ever since I've been getting these new error messages in the Windows log every 30 minutes when the transactional log backup runs.

The backup is set up using the TFS Admin Console and the backups seem to be successful.

TF53010: The following error has occurred in a Team Foundation component or extension:
Date (UTC): 2015-05-25 16:11:57
Machine: DEVTFS01
Application Domain: TfsJobAgent.exe
Assembly: Microsoft.TeamFoundation.Framework.Server, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a; v4.0.30319
Service Host: c89ee410-7dc1-4abc-968c-7491f6098882 (TEAM FOUNDATION)
Process Details:
  Process Name: TfsJobAgent
  Process Id: 1548
  Thread Id: 2584
  Account name: MYDOMAIN\TFSSvc

Detailed Message: TF400703: Unable to initialize the specified service Microsoft.TeamFoundation.Server.Core.PlatformProjectService.
Exception Message: TF400367: The request could not be performed due to a host type mismatch. Please check any connection information and verify the information is correct. The request was executed against a Deployment, Application. (type UnexpectedHostTypeException)
Exception Stack Trace:    at Microsoft.TeamFoundation.Server.Core.PlatformProjectService.ServiceStart(TeamFoundationRequestContext systemRequestContext)
   at Microsoft.TeamFoundation.Framework.Server.ServiceProvider.GetServiceImpl[T](TeamFoundationRequestContext requestContext)

Any idea what this is, and should I be worried?