Syncthing is sorely missing iOS support. I know they have their reasons not to implement it[0], but I feel that feature might be worth the hassle.
Photo sync on iOS without iCloud is a huge pain atm.
My backup strategy involves a NAS folder that stays up to date (i.e. also deletes photos that I delete on my phone), and which I occasionally sort into final location. After that I can free the space on my phone.
All other options (including Resilio Sync) are a add-only "sync"[1], which makes it annoying to sift through all the photos including those I already weeded out a week ago.
Syncthing is entirely made by volunteers, and so far no one has had the time or interest to work on an iOS app. If you (or someone else) wants to work on an iOS app, that would definitely appreciated.
To avoid lock-in with Apple, I tried Amazon Drive for photos. It has worked perfectly for backing up media to their cloud storage. So now I keep my photos in two places.
I actually use OneDrive and it automatically syncs my camera roll from iOS. I use both iCloud and OneDrive and they've both worked basically the same since the day I started using it.
Photo sync on iOS without iCloud is a huge pain atm.
My backup strategy involves a NAS folder that stays up to date (i.e. also deletes photos that I delete on my phone), and which I occasionally sort into final location. After that I can free the space on my phone.
All other options (including Resilio Sync) are a add-only "sync"[1], which makes it annoying to sift through all the photos including those I already weeded out a week ago.
[0] https://docs.syncthing.net/users/faq.html#why-is-there-no-io...
[1] In theory, Resilio has a real sync, but for some reason, not for the iOS camera roll.