Hi,

I have set BackupPC to backup a directory where the content is always 
wiped and re-populated with 99% of the time same filename and same 
content inside the files. File timestamps would be different as they 
have been re-generated.

I expected that BackupPC would detect it's the same filename and same 
content and use hardlink instead of re-copying the file again.

However, I've been monitoring /var/lib/BackupPC/cpool using `du -sh 
/var/lib/BackupPC/cpool` and it seems to be growing at a steady state 
that is much faster than what I expected.

Either I am not looking at the right pool or the way I measure the pool 
size (du -sh) is wrong or BackupPC is not using hardlink in my case.

To confirm my suspicions:
- is  /var/lib/BackupPC/cpool the pool I need to look for
- is `du -sh` the proper way to measure the size of the pool
- how do I know how many hardlinks are pointing to the same file in the 
pool?
- how do I calculate the saving ratio of using hardlink vs simple copy 
the file again? (this would confirm if my instance of BackupPC is 
exploiting the saving advantage of hardlink or not)

Thanks,
Long

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