PicBackMan is the best uploader for Google Photos that backs up 1000s of photos to your Google Photos account automatically. PicBackMan allows users to bulk upload 1000s of photos to their Google Photos accounts and it also automatically manages the monthly limits and other aspects. PicBackMan does most of the uploading and backing up tasks itself, without requiring any efforts from your side.
Here is a quick start guide to show you how to upload photos to Google Photos using PicBackMan’s Google Photos Uploader:
Here’s the video tutorial that you can refer to
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