Hi JA ,
I build a new server including same OS and SQL server software version, same hostname and SAP system (fresh), Will I be able to restore my previous backup from the other system?
As the hostname is kept same ensure that this new server is not published on DNS else it may cause conflicts. Suggestion here would be to use different hostname to avoid hostname conflicts .
Or I'll still need a backup of the SAP Kernel, Win registry and etc. from my original server?
As you will install fresh SAP , kernel version may not be same like source system. Best option is once your SAP is installed on new server, copy the kernel from source system so that both environments have same kernel level.
Hope this helps.
Regards,
Deepak Kori