1. USB cable from iPhone to PC.
2. Sort by date in filemanager.
3. Copy all images since last date backed up to my PC.
4. Review and delete crappy images.
5. Move to my NAS via filemanager.
6. Create a textfile called t.ex. 07juli (so that next time I know to copy files after this date, since I like to keep most pics on my phone).

Do this once or twice a month :)