I've taken thousands of photos with my phones over the last few years. As I know I will never get round (most of the time) to backing them up, manually, I've chosen to use Google's photo thingy to do automagic backups.
Basically all of my photos are backed up to my Google Drive, I think they take up about 9 Gb :-o
I've thought about changing to back up to a NextCloud instance I have, but haven't gotten round to trying it, yet.
Lovely pictures though!