SAP BI back-end Vs SAP BO back-end

Hi Friends,
Purchasing SAP software packages - bought SAP NW 2007s package (included SAP BI) and SAP BO XI suite (included Data Integrator (DI) as part of the BO XI package).
We have below scenarios and discussions around these scenarios - please advice the best practice/method:
1. ECC - > SAP BI(back-end) for storing ECC and other legacy data->BO reporting tools like Crystal Reports, WebI, Xcelsius etc.,
2. ECC -> BO(back-end) for storing ECC and other legacy data using DI for setting up the ETL process -> BO reporting tools like Crystal Reports, WebI, Xcelsius etc.,
3. ECC ->use BI and BO as back-end system -> BO reporting tools like Crystal Reports, WebI, Xcelsius etc.,
Does anyone have reasoning to use both back-ends? The BI and BO packages include the back-end and I think it is up to the customer to choose either one as data warehouse system. Thinking that SAP may also have different package combinations to have either BI or BO back-end to use as data warehouse system which may reduce the license, implementation and maintenance cost.
When it comes to scenario 1 and 2 u2013 How BO ETL handles the massive data extractions, error handling, and parallel extraction and performance issues compared to SAP BI?
Please provide your thoughts in approaching the specific scenarios? It would be great if you could also provide some web links precisely relevant to this discussion.
Thanks,
Sudha

HI,
just to clarify: in the BusinesObjects Enterprise system you not storing data.
1. ECC - > SAP BI(back-end) for storing ECC and other legacy data->BO reporting tools like Crystal Reports, WebI, Xcelsius etc.,
>> for sure possible
2. ECC -> BO(back-end) for storing ECC and other legacy data using DI for setting up the ETL process -> BO reporting tools like Crystal Reports, WebI, Xcelsius etc.,
>> you would then use something that is called a Rapid Mart for example
3. ECC ->use BI and BO as back-end system -> BO reporting tools like Crystal Reports, WebI, Xcelsius etc.
>> yes.
Both backends have a different purpose. BusinessObjects is reporting and BW is a datawarehouse.
Ingo

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[http://fdf.cod.free.fr/screen5.JPG]
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Edited by: Efstratios Karaivazoglou on Mar 22, 2009 12:27 AM

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