Java and Excel sheet (hssf poi) creating back up  please help!!

Dear friends , i have a problem i saved some data into some excel file using HSSF POI . after raeching some lines say a maximum of 1000 lines ) i have to save the EXCEL sheet as backupfile with the extention .bak and then delete the original Excel file . did any body have some idea about this . i know you guyz are gurus so please give some advise
thanks in advance
cheers
harsha

you would actually have a counter to count the number of rows you inserted into the spreadsheet..once counter hits 1000, just save it as .bak extension?

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