store image files in MySQL or flat file

Hi,

I want to compare 2 image storage systems, one in MySQL and one in a flat file format:-

1) performance

As I read some articles / forums that someone says if the image stored in MySQL to be retreive more faster than stored in a flat file and someone have different ideas.

2) backup

Someone said it is easiler to backup the image files stored in a flat file than stored in MySQL database.

3) security

I would like to hear more about the 3 points that I pointed out since I will install the shopping cart in my website. Once I select the image storage method, then I cannot return it back.

Pleaes give advise.

Thanks a lot.

Regards,

Andy Ng