By default PicBackMan uploads photos and videos in batches of 5000 to speed up things. As soon as it completes uploading current batch it will pick up next batch or 5000 photos automatically. So you need not worry on this front, every photo or video will be uploaded via PicBackMan.
PicBackMan is a free photo/video uploader that helps you to keep your memories backed up to your favorite online services.
Users in 130+ countries have backed up.
... an excellent job of uploading more then 300GB of photos to 2 different services