I can’t speak to NAS, I’ve always “rolled my own” because no none makes what I want, let alone in a price point I can manage (I like to use 2.5" drives with a moderately powerful system as a media center/home server, etc, for compactness). My current box is an old small-form-factor desktop that maxes out at 3 drives, though I have 5 shoved into it.

For photos I use Syncthing (specifically Syncthing-Fork as it has more flexibility) on my phones to sync the DCIM folder to an always-on machine at home.

My DCIM folder syncs to a folder in my user profile on the server, other people sync to their respective folders. I permit this sync job to run in any network, with any power (AC or battery), so I never lose pictures I take.

This has a benefit of enabling me to manage photos from a pc, and those changes sync back to my phone (I generally move the photos out of the synced folder to somewhere else, this has the effect of removing them from the phone). Just don’t use the built-in photo backup sync job, which only syncs photos from phone to PC.

Nice thing about Syncthing is you can sync anything anywhere however you want. Windows, Linux, Max, iOS (using Möbius).

I currently sync hundreds of gigs between several phones and several PCs. I have about a dozen sync jobs (folders in SyncThing terms). I also sync other folders from phones, to enable file management from a PC, since changes will be synced back with two-way sync jobs.