About dedupe server of DLO 7.6

Hi,

Just deployed DLO 7.6 and configuring it.

1) How to consider dedupe server is needed or not ?

2) Since all DLO applications were installed on same server. If dedupe server was used, how much performance will affect to the server ?

3) Dedupe affected to destination only ? Source PC / Laptop files still deplicated ?

Thanks