Does anyone else get this?

Hi e100
The manual df was issued while this same backup was running and came back quickly with the correct results.
wouldnt that be affected by the same IO problems then?
 
Again just a guess but maybe this happened:

GUI tries to get data, it is taking long time and times out but some of the data needed was gathered and stored in the disk cache.

Then you run it manually and it reads some data from the cache gets the last piece of data from the disk and presto returns quickly.

When doing heavy IO df can get slow.