Identical backup can be very different..

Hello,
I backup all content from time capsule to hard drive. Perfect Identical back up, same files, just copied. 10 hours needed but no errors.

- Time Capsule shows 973 GB of space employed and 25,04 GB of space free.
- Toshiba shows 998 GB of space employed and 1,98 GB of space free.

25 GB of difference!? Too much. How is it posible?

Details :

- Info screen-shot

- Lion version 10.7.2

- Disk Toshiba 1TB Model E05A100PBU3XS (formatted Exfat)
http://www.bhphotovi...o_3_0_Plus.html

- Time Capsule 802.11n (1st generation) 1TB

Thank you in advance for helping.
Grazie mille in anticipo per tutto il vostro contributo

 

Thank you. I copied with Carbon, Much better than before, but continue to not understand why this 2 disk are not identical.
Time Capsule:973.013.221.376 byte (973,01 GB su disco) - 25,04 GB free
Toshiba: 984.026.054.656 byte (984,03 GB su disco) - 16,15 GB free

Here it is all info, as you can see, folders are identical but the total at the end is difference. Example for folder named "Time Capsule" the bigger folder:

Folder name: "Time Capsule" - on both disks the dimension of this folder is the same 931.017.075.505 byte but dimension on disk and number of files on disk change! How is it posible?
Time Capsule disk: (931,24 GB su disco) for 102.955 elements
Toshiba disk: (939,31 GB su disco) for 102.969 elements
Dimension of Folder named "Time Capsule" on Time Capsule drive and Toshiba drive: 931.017.075.505 byte (identical).

- Info drives before and after copy

- Carbon Copy says OK

- Comparing folders
(Note: Dimension total byte are always the same but GB on the disk are always more on Toshiba and number of elements are different):

Total byte, Number of elements and GB on disk of folders on Time Capsule drive:
- Colombia Musica: 6.893.763.121 byte (6,9 GB on disk) for 1.845 elements
- Materiale Didattico: 1.379.154.644 byte (1,38 GB on disk) for 268 elements
- Rosetta Stone: 7.573.845.325 byte (7,58 GB on disk) for 666 elements
- Simon: 25.717.732.831 byte (25,73 GB on disk) for 5.474 elements
- Time Capsule: 931.017.075.505 byte (931,24 GB on disk) for 102.955 elements

Total byte, Number of elements and GB on disk of folders on Toshiba drive:
- Colombia Musica: 6.893.763.121 byte (7,02 GB on disk) for 1.849 elements
- Materiale Didattico: 1.379.154.644 byte (1,4 GB on disk) for 268 elements
- Rosetta Stone: 7.573.845.325 byte (7,62 GB on disk) for 666 elements
- Simon: 25.717.732.831 byte (26,08 GB on disk) for 5.470 elements
- Time Capsule: 931.017.100.081 byte (939,31 GB on disk) for 102.969 elements

Curious on Simon folder there are less elements on Toshiba 5470<5474 but also in this case Gb are more on Toshiba 26,08>25,73

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I hope these informations can help you to help me, thanks in advance.