As far as I know there is no facility for this in IP Office. I Don't know what OS you're running, but I have a script which sbs2003 executes every morning to archive recordings of phone calls. Assuming you're running in a similar environment, this should do the job. It was actually pretty much written for me by somebody on a different forum, but I have adapted it to fit your problem below:
XCOPY "C:\Program Files\AVAYA\IP Office\Voicemail Pro\VM\Accounts\Acc1\*.wav" "C:\Program Files\AVAYA\IP Office\Voicemail Pro\VM\Accounts\Acc2\"
IF ERRORLEVEL 5 GOTO DISKERROR
IF ERRORLEVEL 4 GOTO INITERROR
IF ERRORLEVEL 2 GOTO CTRLC
IF ERRORLEVEL 1 GOTO NOFILES
IF ERRORLEVEL 0 GOTO SUCCESS
GOTO END

ISKERROR
echo A disk error occured.
REM This line is a REMARK line (or comment). It does nothing.
REM You can put any commands you want here! When the batch file
REM hits GOTO END, it will do just that - go to the label marked "END".
GOTO END
:INITERROR
echo Initialization error occurred. There is not enough memory or disk space, or you entered an invalid drive name or invalid syntax on the command-line.
GOTO END
:CTRLC
echo User pressed CTRL-C!
GOTO END
:NOFILES
echo No files were found to copy.
GOTO END
:SUCCESS
echo Files were copied successfully!
GOTO END
:END
echo Done.
You will obviously have to replace Acc1 and Acc2 with the names of the accounts you are copying from and to respectively and you may have to change the directory for Avaya, but otherwise if you set scheduler to run this script however often you want copies made, it should do the trick.
Hope this helps.