How do I download /export my iPhotos to a memory card on my camera?

Question

I am trying to "organize" my camera memory cards, which I want use as a back up rather than just using external or USB drives. I can not find how to Export photos to a new memory card in my camera.
The reason I want to do this is because when I've saved on a USB or External Drive, the photos are zipped, & then when I uploaded back to my mac (when I needed to get a new one), the dpi & KB is really low (270 x 360 & 54 KB compared to over 2000 x 1500 & 255 KB for recent photos!)
The iPhoto help manuals & Apple site helps don't address this exporting, only how to export to Email & the web.
I was told by someone USB & ED's "don't change the size" (it does zip them) & to increase the dpi & KB on those, just "double click" on each photo in the iPhoto app - didn't work! So any other better / real ideas how to increase the dpi/KB would be more than welcome, as I can't print any of my older photos, the size is too small!
Mille Grazie, Gracias, Merci, Danka
PS - My camera is a Canon Power Shot A590. Last time this was discussed was in 2006, & suggested to "buy a usb plug in card reader & drag photos ..."

Answer 1

PS - My camera is a Canon Power Shot A590. Last time this was discussed was in 2006, & suggested to "buy a usb plug in card reader & drag photos ..."
Still the answer since Canon Camera's will not mount to the desktop
I am trying to "organize" my camera memory cards, which I want use as a back up rather than just using external or USB drives.
Why? memory cards are not very reliable - using Time Machine and an external hard drive is a MUCH better way to backup - I run TM so I have hourly backups - do a daily bootable clone - ane I never have iPhoto delete my photos when I import them so I have the originals too - and if you really want a backup on your memory card this is the way to have one - do not delete when importing
The reason I want to do this is because when I've saved on a USB or External Drive, the photos are zipped, & then when I uploaded back to my mac (when I needed to get a new one), the dpi & KB is really low (270 x 360 & 54 KB compared to over 2000 x 1500 & 255 KB for recent photos!)
This is user error - not in any way a function of backing up to an external Drive - a properly done backup and restore gives you exactly what you had whe you did the backup - that is the whole purpose of a backup - and it works perfectly if done correctly
I was told by someone USB & ED's "don't change the size" (it does zip them) & to increase the dpi & KB on those, just "double click" on each photo in the iPhoto app - didn't work! So any other better / real ideas how to increase the dpi/KB would be more than welcome, as I can't print any of my older photos, the size is too small
this is a very cofussed set of statements
1 - no backup "changes the size" of the photos - the entire purpose of a backup is to have an exact copy available in case of problems
2 - Most backups do not zip photos - some do - zipping does not change the content when you unzip
3 - DPI is not an atribute of a photo - it is a mathmatical caculation - dots (pixels) divided by inches - you do not have DPI until you have inches (either a display or a print)
4 - the only way to "change" DPI is ot change inches - for a given photo the only way DPI can be increased is by printing a smaller photo - decreasing inches
5 - the KB of a photo is not material - the only things that is interesting is the pixel dimensions - and you can not make them larger
Basically you are chasing the wrong things - buy an external drive formatted Mac OS extended that is 2 1/2 times the size of your main drive and run Time Mahcine all the time with its default settings
LN