My incremental backups seem to be taking FOREVER now.
I am backing up my server onto a SOHO NAS device.
Incrementals used to to take about 30 minutes.
Now it has been running for 16 hours and it is only partially through
(though not stuck). 

I don't think it's a network bandwidth/transfer speed issue since
NewFileList shows that only 1068 new files have been accumulated in 16
hours (and there are no super long or multimedia files -- it really
has just been backing up mostly my /usr partition). 

In fact, the total size of the partition is 13GB so the speed is only about
220KB/sec even if all files were transferred completely. Even with
BackupPC running, I can get raw UDP network transfer speeds of
11MB/sec between the server and the NAS. And the NFS transfer speeds
to copy a file using dd is about 5.5MB/sec. These speeds are 50 and 25
times the speed it would take to copy over the entire partition yet
BackupPC is still running...

Also BackupPC is consuming minimal processor resources (and nothing
else is much running either on the server or the NAS). Also minimal
swap space is being used.


And since BackupPC itself is running on the server so for an incremental
there shouldn't be much need for bandwidth over the NAS link anyway
(especially since I have rsync checksum caching).

So what should I be checking as possible causes of such a dramatic
slowdown of incremental backups?



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