Legitimacy of digitization of the copyright subject?

Question

Books

I have a collection of books, records, cassettes, audio CDs that have been absolutely legitimately bought from various sources for decades, both by me and by my parents. At the moment, the volume of all collections takes up a whole room, I'm going to digitize and use them for personal purposes. At the same time free up space. Organize your cloud, access only to relatives.

I know that for public access via the Internet, libraries negotiate with authors and copyright holders. However, when I digitize the subject of copyright, I create another copy, albeit a digital one.

I am interested in the legal point of the question, do I have the right to digitize analog content for personal use and how then to prove that this content was actually purchased? Do I still need to save analog samples for this?

There was an idea to cling, some kind of personal watermark, but I don’t know if it will help. PS: I'm not going to

distribute on trackers, or give public access to my cloud .