Export Pictures Folder or iPhoto library to an external drive.

Hi

I am unable to copy the Pictures folder to an external hard drive. I receive an error message saying there is insuffience disk space to perform this function.

I had a MacBook Air stolen and backed up to an old eMac which has proved useless. I now want to remove all 10 000 photos from the eMac and place them

onto an external drive.

I have read the posts from TD and fromedinborough about iphoto Library manager and sync. I am hoping to try something else please.

I will be most grateful for any help.