Photos and iCloud cannot see photos on iCloud safe to delete? I want to delete photos from my Mac to free up space. I've never gone to iCloud before to check on my back ups and just assumed they occurred. However when i go to iCloud it shows nothing but find phone. Is there a way to see photos? The only question i see that actually addresses this is negatively voted on, and the only answer did not address the Question but was geared toward organizing library and space on cloud. I just want to know my stuff is there. How? if I cannot see it??
If you enable iCloud Photo Library on your Mac, and your photos are on the Photos app, you can set it up to save originals on the cloud and automatically save space by keeping a lower resolution copy on your Mac.
To do this, go to Preferences > iCloud, then select "Optimize". 

This will also allow you to view your entire collection on iCloud.com if you wish.

Note that you have no saying on when the app starts "saving space" on your behalf, and that if you delete a photo on your Mac it will be deleted on iCloud too; it is more a synchronization service than a storage on the cloud service, with the advantage of the space optimization.

Also, there is no Mac iCloud backup service to my knowledge; you can only backup to Time Machine —or some other backup service of your preference, of course. You may have some of your documents synchronized to iCloud but if you delete them locally they will also be deleted there.
Time Machine erases old backups when it runs out of space, so it won't work as a long term storage solution either, unless you have lots of space available —so it does not need to delete your old backups in order to make space for the new ones.