Hello!
Today try look to one server, who work as backuppc under Debian, and see very strange for me, thing, who i cannot understand.
there is 5.4 Tb partition on /

and i see in/var/lib/backuppc/compname some folder, where do "ctrl+space" in midnight commander show about 1042 - 1057 Gb in some folders - summary there shows more use space, than is in that disc itself.

how can it be possible?
FS is ext3

go inside one of that folder - "select all" - the same summary size, about a
1,076,752M bytes in 15713 files

how it is possible? there is several folders like that, with summary size about 25880G ( ~25 Tb? )?


oh yes - on df -h and so all is correct - consumed space is less than total, but if look at that folders, and count wasted space....

Sparse files, hard file links, soft dir links, submounted/binded partitions?

Check and comapre results:

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1178564068

27168420656

1177198517


that means, there is a hardlinks?

submounted \ binded partitions, as i understands, is easy to see via "mount" command...?

So it looks.

Yes.

You may find them by this command (I'm not sure it is 100% correct):

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Backuppc (and rsnapshot) uses hard links to provide multiple snapshot-style full backups. The space required is the sum of one full backup plus all the differentials since that full. But hard links create the illusion that each of the subsequent snapshots occupies at least the same amount of space as the first.

Information about Backuppc hard links here.

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If my wife emptied her handbag, the volume of stuff coming out would be bigger than the space inside the handbag .... it's the same thing .... :-)

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ok, thanks for info. i be hear abou dduplication in backuppc, but i thinking, it is backuppc internal mechanism, who provides it, not on filesystem level.
thanks for enlightening, also a thanks to Labinnah for help