My options:

1. Local backup

2. SelfHosted cloud like own Cloud or next cloud

3. Get the hard copy and put it in beautifully crafted albums

4. OneDrive/Dropbox/GooglePhoto/iCloud/Flickr for anything which isn't personal with still my privacy settings ON. I treat them the way I treat images downloaded from Internet.

PS: Assuming that those are your personal photos as you are concerned about privacy and you describe yourself as a data scientist.