Cube backup job failed

Message
Executed as user: INTRANET\SSAgentTrendP1. ...ystem error: The following error occurred while the '\\?\H:\MSSQLDATA\TrendP1\Trend.0.db\Trend.0.cub\Claim Summary V.0.det\Claim Summary V.0.prt\8.fact.data' file was being copied to the 'G:\MSSQLDATA\TrendP1\Auto_before.abf' file: . at Microsoft.AnalysisServices.Xmla.XmlaClient.CheckForSoapFault(XmlReader reader, XmlaResult xmlaResult, Boolean throwIfError) at Microsoft.AnalysisServices.Xmla.XmlaClient.CheckForError(XmlReader reader, XmlaResult xmlaResult, Boolean throwIfError) at Microsoft.AnalysisServices.Xmla.XmlaClient.SendMessage(Boolean endReceivalIfException, Boolean readSession, Boolean readNamespaceCompatibility) at Microsoft.AnalysisServices.Xmla.XmlaClient.SendMessageAndReturnResult(String& result, Boolean skipResult) at Microsoft.AnalysisServices.Xmla.XmlaClient.Execute(String command, String properties, String& result, Boolean skipResult, Boolean propertiesXmlIsComplete) at Microsoft.SqlServer.Management.Smo.Olap.Soap. The step failed.

This is the job step definition:

<Backup xmlns="http://schemas.microsoft.com/analysisservices/2003/engine">
<Object>
<DatabaseID>Trend</DatabaseID>
</Object>
<File>G:\MSSQLDATA\TrendP1\Auto_before.abf</File>
<AllowOverwrite>true</AllowOverwrite>
<ApplyCompression>false</ApplyCompression>
</Backup>

This job has been running for a while. The problem started after I did a restore of the cube at one point of time.

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Further investigation reveals that one of the fact.data file had growed to 4G in size and the backup started to fail.

Is there a size limitation of individual partition's size in SQL Server 2005 OLAP serivice? I have searched the BOL but can't find any reference.

Thanks,

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according to MS it has been removed from 2 g from SSAS 2000 to no limit in SSAS 2005!! but facing same error message while backing up!!