Backups are taking about three hours for a particular fileserver and records 
indicate that over 300k new directories are being created every run. 

I opened the XferLOG in a browser and searched for the word "create d" which 
catches every newly-created directory. The count was 348k matches. But the file 
count in the summary is only 4724 files [sorry for the formatting]:
                        Totals                                  Existing Files  
        New Files
Backup# Type    #Files  Size/MB MB/sec  #Files  Size/MB #Files  Size/MB
31              incr    47568   10101.0 0.79            46950   8907.8  4724    
        1194.5

I'm not sure what the columns mean but the last line of this server's backups 
file is:
31      incr    1470272401      1470285236      47568   10591687070     46950   
9340510442      4724    1252472758      0       0       0       0       3       
6056094411   360393014

During this run the /var/lib/BackupPC//pc/$host/new/ folder grew at least 2.7G.

Is this expected behavior? Why does BackupPC think it needs to create new 
directories?

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