Halo Syed ,
May be in future all the applications are going into cloud but sap is also thinking of time and payroll , as of now talent modules are on the cloud , u can open success factors from any corner of the globe like ur gmail and facebook with the URL , by 2020 or 2025 all sap application may be on full cloud based and performance is also very fast as it is URL based ( cloud )and not on -premise.
Regards,
Lea.