Hi,
We have got our backups setup to both local NFS share and Backint tool to tapes
Based on the infrastructure we have in place the backups are about 50% slower to the Backint Tape compared to the NFS share
However it is still a good option because the backups when taken to NFS share need to be copied to tape at a later time and Backint process is a one step job
Regarding your latest question for restore:
You would not need the Config files for a restore if the source and destination is the same system
You would need the config files to be checked and set to the same values if you are restoring from a Source to a different Destination system
Our Backint tool documents not to recover the backup from one source to another destination as it is not supported, so we use local backups for refresh from PROD to Non Prod(we already make sure the config files are identical across all systems before restore)