Here is the update. Interesting finding. The first time an incremental files backup is run, this appears in the log:
Indexing of “E” done. 3265 filesystem lookups 0 db lookups and 0 db updates
The next time:
Indexing of “E” done. 1 filesystem lookups 3264 db lookups and 1 db updates
So the first time it reads all the files from the disk, presumably stores them in its internal database, and the following times it reads them from there.
Excellent! But… it only lasts till the next reboot, after which the files are read again from the disk.
I tried deleting C:\Program Files\UrBackup\urbackup\{backup_client.db*|hdat_file*}. They are successfully recreated, the described behavior does not change.
@uroni Maybe you have an idea what might cause this? I sent you the debug.log file by email. Looks like an error with journaling? Thanks!