I just backed up a new instance of a raspberry pi that is a pretty
close clone of an existing one.

The backup size shows as follows:

   File Size/Count Reuse Summary
   Existing files are those already in the pool; new files are those added to 
the pool. Empty files and SMB errors aren't counted in the reuse and new counts.
                      Totals                          Existing Files        New 
Files
   Backup#   Type     #Files   Size/MiB   MiB/sec     #Files   Size/MiB     
#Files   Size/MiB
   0         full     117300   4179.6     9.07        20044    542.7        4   
     0.2


I would have thought that: Totals = Existing + New
(with the exception that there might be some double counting due to multiple 
copies of the same file)

However, I don't think this explains the difference between:
         Total = 117300 files
         Existing + New = 20048 files

         Total = 4179.6 MiB
         Existing + New = 542.9 MiB

Am I missing something here???

Also, according to 'df' the actual number of MiB on the partitions
being backed up is 3920.0 MiB.  Since I am excluding /tmp/ and a small
number of other directories and files, the actual raw size of the
files to be backed up is < 3920 MiB.  Running 'du -sxb' shows the
usage is: 3678.0 MiB.

So why does backuppc show a total backup size of 4179.6 MiB that is
bigger than the total space used on the 2 partitions being backed up
as shown by 'df' or 'dh'?
Could this be explained just by sparse files?


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