I would like to suggest that a 'Merge' option is included in the 'Identity Safe Data' backup and restore procedures.
At present, when restoring data it deletes all current data before reloading the backup file.
Therefore you lose any additional logins & cards you have added since the backup.
This would save a lot of time re-entering data.
Also, when backing up the data, you would be able to 'Merge' it with a previous backup, and not have a load of NPM files with differing data on each.
This method should be incorporated in both NIS and N360, as these NPM files are compatible with both systems.
I suppose this could be called 'Syncing'.
The present 'Overwrite' option should still be there, for anyone who wants to start afresh.
[Subject edited to improve clarity.]