You have a Hyper-V cluster with Cluster Shared Volumes (CSV). You have a clustered VM on this CSV volume.
You are using agentless backup for virtual machines.
Once an Acronis job runs on the host, any attempt to redirect Cluster Shared Storage (CSV) volumes to that host result in the volume going into ‘Online (Redirected Access)’ status.
The issue is under investigation.
Acronis development team is working on the issue. This article will be updated once a fix is available.
As workaround, install Acronis agents into the guest operating systems of your virtual machines.