Immich for sure. Which a bunch of people have already suggested.

That said, make sure you also invest the time and energy into a proper 3-2-1 backup strategy:

• 3 copies: your primary pool of data (Immich library) and at least two backup copies
• 2 different media types: SSD/NVMe as well as HDD NAS (as an example)
• 1 copy off-site: cloud backup and/or another server located at a friend's house

How I do it:

• Immich lives on my Unraid server which is 3x14TB spinning HDDs (two arrray disks and one parity)
• NIghtly backup to another small server in same physical area as Unraid server but using NVMe storage
• Nightly backup to yet another small server with NVMe storage at a family members house
• Nightly backup to Backblaze B2 storage

Sounds like a lot but was affordable (not so much anymore because of AI driving the cost of PC parts through the roof. Both of the "other" servers are cheap PCs. One is a Raspberry Pi 4 running on a 2.5" SSD rather than microSD. The other is an old Lenovo Thinkcentre micro PC that I paid $60 for at a computer recycling place.

B2 storage is pretty affordable. I pay around $5/mo for just my photos/videos. It's less than 1TB currently. There are heaps of other cloud storage options. B2 just seemed to fit well for me. Worth noting that up until recently, you had to either encrypt the data yourself before sending to Backblaze or have them do it for you, but that meant they had the encryption keys. They just implemented always on encryption though. But again, they have the keys. So I encrypt it before sending it off.

Long winded explanation. But early in my family's digital picture journey I had a close call and thought I lost wedding, honeymoon, and early baby pics due to a computer crash. Since then I've been more cautious and thoughtful.