What is your approach to store and manage photos?

A server in my closet + cloud backup to Backblaze once a week. This is overkill, but for any data you care about, you should have onsite + offsite backups.

Mac mini with extra harddrives and backblaze. I’ve always debated whether or not I should add NAS but figure backblaze is enough redundancy. I have storage figured out, but management is a disaster. Would love to know what people do for that with multiple people in a household.

The thing you get with a NAS is the management. Synology software makes it relatively easy despite their apps not always being A+ experiences. Also if you're not running those extra HDDs in RAID (1 or better), you're going to have a very bad day eventually