Hello
IBP is available on cloud and on premises. It used Hana as database in both the scenario. most customer goes for cloud version which offer all the advantages as SAP managed the software/upgrade and ensure system is available. In either case excel add in software available in the SAP marketplace for correct version of IBP is required to be installed to access IBP master/transaction data /different scenario/functionality.. Excel front end was established for easy access to IBP users
I hope this helps
Regards
Anil