MSSQL 2008 R2 - 32bit, TSQL backup with compression, error: There is insufficient system memory in resource pool 'internal' to run this query

Hello,

I would like to ask you about advice.

We have MSSQL 2008 R2, 32 bit. Memory is 4GB, split into 2GB for Windows and 2GB for applications. Database has recovery model simple because we have replicated data into other servers ( 2 ). Contemporary we work with 2 servers. Max memory for MSSQL is 2048 MB.

We set thebackupas follows:

USE MSDB
GO

DECLARE @JMENO_ZALOHY VARCHAR(120)
SELECT  @JMENO_ZALOHY = 'E:\backup\BackupSQL\1 Pondeli\DAVOSAM_'+ convert( varchar(2), datepart( hh, getdate() ) ) + '00_DEN_DIFF.bak'
SELECT  @JMENO_ZALOHY

BACKUP DATABASE [DAVOSAM]
TO DISK = @JMENO_ZALOHY
WITH INIT, DIFFERENTIAL, CHECKSUM, COMPRESSION
GO

Every second or third day in log there is error message: 'There is insufficient system memory in resource pool 'internal' to run this query' Accurate in time of backup. The error is still repeat, majority in working hours.

Today I have found out, that problem is probably in compression of backup. Because if I removed word: compression, a backup normally runs without error.

Question: Is my hypothesis correct that problem is in backup with compression?

Thank you David