difference between backup 6002 and 6003??

difference between backup 6002 and 6003??

Hi Everyone!

Backup_sdp_6003_04_18_2007_09_09.data is my last backup file and the problem is that I can't open it.
My latest backup file is Backup_sdp_6002_04_24_2007_15_08.data and it works good.
So, my question is...why 6003 is not working and 6002 is; and why are there two different versions of backup file from same SD+ at all??

...anyone please.
thanks!






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