I backed up my iPhoto library to my EHD then deleted some photo in iPhoto on my iMac to make more HD space. I want to back up iPhoto again to my EHD again but do not want it to overwrite the whole library. How can I make sure it backs up the new photos

Ok so how can i just back up the newer photos to my iPhoto library on my EHD? If it overwrites the backed up library it will delete the older photos that I backed up and then deleted from my iMac HD.

Do you want to back up only your photos and not your current library? Then you will not get a backup of your albums, books, calendars, ..
A lot ofyour organizational work will not be backed up, if you only save the newer photos.
To find the new photos create a smart album:
From Photo's main menu bar:  File > New > Smart album
and add a rule: Date is after ....  ; enter the date of your last backup.
Then export the photos from this album to a folder on your backup drive.
File > Export > Original
But it would be much better simply to copy the iPhoto library to the external drive, after renaming the older library, so that it will not be overwritten.
Regards
Léonie
You might consider to let TimeMachine do the work and keep track of changed versions.
Use Time Machine to backup the library regularly, so you always can restore a current version aand can find older photos that have been deleted, and make occisiona snapshots of the whole library on a second backup drive.

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