Deleting duplicate photos from library/albums
For a variety of reasons (mainly carelessness) I find myself with over 1000 duplicate photos in my photo library. One of those duplicates also feature in one of several albums or another.
The contents of these albums are very precious.
I know how to identify and delete duplicates through 'Duplicate Photos Fixer Pro' software, but which of the several duplicates in the library do I delete without compromising the contents of the album?
My understanding is that if you delete a photo from the library, it will also delete that same linked photo from the album.
Questions...
1) Is my understanding correct?
2) How do I ensure that I don't delete the wrong photo/s in the library which then may be lost forever in the album?
3) Is there more failsafe software I should be using?
Thank you,
Simon