Hey there! I've been lurking on the forums for a good while. I managed to get the Home Server (v1) connected to Windows 10 after following the guide, but now I have a problem. After using WHS BDBB once, I've been unable to make backups of Windows 10, manual and automatic. Checking Event Viewer on Win10 shows this.

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Backup set 48 on SERVER failed: Microsoft.HomeServer.Backup.Protocol.ProtocolException: Client / Server connection lost
at Microsoft.HomeServer.Backup.Protocol.ReconnectableStream.TryReconnect(Int32 localGeneration)
at Microsoft.HomeServer.Backup.Protocol.ReconnectableStream.WriteWithReconnect(Int32 count)
at Microsoft.HomeServer.Backup.Protocol.ReconnectableStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at Microsoft.HomeServer.Common.Client.BinaryWriterEx.Write(Byte[] value, Int32 offset, Int32 length)
at Microsoft.HomeServer.Backup.Protocol.BackupProtocol.SendClusterData(Int64 clusterIndex, Byte[] data, Int32 offset, Int32 length)
at Microsoft.HomeServer.Backup.BackupOp.BackupOperation.DoClusterPass2()
at Microsoft.HomeServer.Backup.BackupOp.BackupOperation.RunWithoutCatch()
at Microsoft.HomeServer.Backup.BackupOp.BackupOperation.Run()
at Microsoft.HomeServer.Backup.BackupOp.BackupSetOperation.RunWithoutCatch()
at Microsoft.HomeServer.Backup.BackupOp.BackupSetOperation.Run()

Backup of volume C: to SERVER failed: Microsoft.HomeServer.Backup.Protocol.ProtocolException: Client / Server connection lost
at Microsoft.HomeServer.Backup.Protocol.ReconnectableStream.TryReconnect(Int32 localGeneration)
at Microsoft.HomeServer.Backup.Protocol.ReconnectableStream.WriteWithReconnect(Int32 count)
at Microsoft.HomeServer.Backup.Protocol.ReconnectableStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at Microsoft.HomeServer.Common.Client.BinaryWriterEx.Write(Byte[] value, Int32 offset, Int32 length)
at Microsoft.HomeServer.Backup.Protocol.BackupProtocol.SendClusterData(Int64 clusterIndex, Byte[] data, Int32 offset, Int32 length)
at Microsoft.HomeServer.Backup.BackupOp.BackupOperation.DoClusterPass2()
at Microsoft.HomeServer.Backup.BackupOp.BackupOperation.RunWithoutCatch()
at Microsoft.HomeServer.Backup.BackupOp.BackupOperation.Run()
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Event Viewer on the Home Server shows this.

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Client Backup server failed at d:\wssg_src\whs_pp3\qhs\src\backup\util\diskfile.cpp(421)

Unexpected error 0x70 from WriteFile on D:\folders\{00008086-058D-4C89-AB57-A7F909A47AB4}\Data.4096.68.dat: There is not enough space on the disk.
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I don't know why its saying there's not enough space when I have about 1.48TB of Free Space.