If others have shared files and folders with you, then you will see those files and folder in "Shared with me". These files and folders will not sync to Google Drive folder on your computer unless you add them to "My Drive" or individual folders which you have synced.
Quick Tip to ensure your Photos never go missing
Photos are precious memories and all of us never want to ever lose them to hard disk crashes or missing drives. PicBackMan is the easiest and simplest way to keep your photos safely backed up in one or more online accounts. Simply download PicBackMan (it's free!), register your account, connect to your online store and tell PicBackMan where your photos are - PicBackMan does the rest, automatically. It bulk uploads all photos and keeps looking for new ones and uploads those too. You don't have to ever touch it.
Automate backup & migration of your photos & videos with support for all top services.
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“Your pictures are scattered. PicBackMan helps you bring order to your digital memories.”