It would be difficult to recommend Immich as a gallery app to someone who doesn’t have experience in selfhosting.
You already have plenty of responses, but immich is not an gallery app. I’m in the process of migrating my photo libraries to immich and it’s 20+ years of memories. Some are originally taken by film camera and then scanned, others are old enough that camera phones just didn’t exist and we had “compact” digital cameras. Then there’s photos taken with DSLR and drone and obviously all of the devices have changed multiple times over the years, so relying on just a single device is just not going to work over time.
All of those require some other system to store, organize, back up and enjoy than the device itself. And, as I have family, storing them on just my desktop would mean that no one else around would have easy access to them. And with immich I can easily share photos around when I carry DSLR with me in a family gathering or whatever.
And then there’s the obvious matter of having enough storage. Even my desktop doesn’t have a spare terabyte right now to store everything, I need the hardware anyways, so it just makes sense to keep them separated from my workstation which I can now do whatever I want with without worrying I’d lose any of those precious memories. And for the server part, I’m having one around anyways for pihole, home assistant, nextcloud to store/back up other data and so on, so for me it’s the most convenient approach to run immich server on there too.
And for the backup side of things. I’ve tried manual backups with various stuff over the years. It’s just not going to work for me. I either forget or life gets in the way or something other happens and then I’m several days or weeks behind the ‘schedule’. With dedicated server I don’t have to do anything, everything is running automatically at the background while I’m sleeping or doing something else more interesting than copying over a bunch of files.
If you can’t access the hardware physically and you don’t have someone on site who can work on it, just drop the idea and get a VPS or whatever cloud based. No matter what hardware you plan to use. Anything and everything can happen. Broken memory module, odd power surge, rodents or bugs messing up with the system, moisture or straight up water leak corroding something, fan failure overheating the thing and so on.
There’s only one single fact on the business that I’ve learned over 20something years I’ve been working with IT: All hardware fails. No exceptions. The only question is ‘when’. And when the time comes you need someone to have physical access to the stuff.
I mean, sure, your laptop might run just fine for several years without problems or it might have shipping damage over that 3000km and it’ll break in a week. In either case, unless you have someone hands on the machine, it’s not going to do much.