Regarding the fail - nothing I can comment as I have no information
Regarding incremental backups: I backup 2 computers every day via FTP. As a test I uploaded a file to one of the computers and kicked off the backup again. Here's the resultant log:
- Code: Select all
/sph_test.rtf -> "sph_test.rtf"
FINISHED --2011-05-20 07:24:08--
Downloaded: 1 files, 356 in 0s (663 GB/s)
Backup finished. Fri May 20 07:24:08 CEST 2011
As you see - only one file is reported as backed up which is the file I uploaded, indicating an incremental backup. (As does the unrealistic effective transfer rate reported)
So clearing the NAS does implement incremental FTP backups and so his would suggest that there is something particular to your scenario that is causing the full backup run. There is of course the possibility of a firmware issue, but perhaps something related to time differences between source & destination? Or could it be that the timestamps of many, but perhaps not all, files in the source are somehow being changed?
You could try creating a new job that backs up a small amount of the same source data and run multiple times to figure if incremental backups are just not working for you (ie indicating a firmware related problem) But if the job is implemented as incremental, it would then point to the problem likely being related to data changes or your network setup and at least narrow the issue down