We don't have a plan for adding incremental backup to NVS series.
For ND2730, we do have plan for incremental backup and already done on it at the R&D level. But not included in the last firmware because it is not tested enough to release. We don't want people miss their data by adding this function. If you have a mind on volunteering this incremental test, pls let us know. We can send preliminary firmware.
Answer by George2012-02-28
I would like to try the incremental backup, and have emailed twice without any reply.
Please let me know where to address the email.