ICal backup file swells from 20 MB to 165 MB when copied to USB drive

I want to create an iCal backup using the FILE/BACK UP ICAL menu command.
When I use this to create the backup file saved onto the hard drive, the backup file is 20MB -- but when I copy it to a USB thumb drive for transfer to another computer, the file swells to 165MB on the thumb drive.
I've never seen this before. Does it indicate something going wrong with the data? What if I restore iCal to the other Mac using this massive 165 MB file?
Using 10.5.8 Leopard

p/s given the above problem, I used Target Disk mode and FireWire to transfer the .icbu file from one Mac to another, and the file size that was copied to the other Mac was roughly the same MB size, and updated iCal with no problem. Still curious about the problem of using the USB thumb drive though.

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ICal backup file swells from 20 MB to 165 MB when copied to USB drive

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