I have been using that feature for, I don't even remember how long, but definitely since it was marked beta or something. I am not a heavyweight like some other in this thread, but my current local state is 70GB and ~30k files, global state is ~50GB (I need to prune WhatsApp on phone again) and ~10k files. I am no biggie, but its not a slouch to keep all this working in 7 devices, with overlapping directories shared between them, across 2 timezones, over local and public network. Zero complaints is exactly my experience. Syncthing Just Works™

Great, because even 1 complaint there would be too many, wouldn't it?

I agree. And that's my gripe with Dropbox, Drive, OneDrive (the big 3 that I was able to try, no apple devices). Every one of them has shit the bed on me, on more than one occasion. That's after burning my bandwidth and taking away my privacy. Syncthing just wins out every way (as long as problem scope is file sync, not cloud storage or sharing).

That scared me too. I just move what I want to delete from the original sync folder over to another folder, causing the phone data to be deleted, I even wrote a script that "partitions" that old data, also syncing to some random server after being fully encrypted (that server ofc doesn't have decryption keys).

In practice you could just turn on Trash File Versioning with infinite retention too.

>I was evaluating Syncthing for 1-way, append-only phone photo backup, and my Google searches warned me away from this, talking about "unsupported" and "database corruption."

Same here. What do you use instead? I haven't been able to find a good open-source multiplatform project for backups/1-way sync.

It's not open-source, but I ended up using PhotoSync for myself and my wife to a locked-down samba share on my LAN .

They had a pretty reasonable (~$6) in-app purchase to unlock samba access, and the fact that it's a German GmbH means I'm slightly more confident they're not trying to copy all our photos to a dark data-vault.

Happy user so far, though it took some cross-checking against the samba share feel confident it was backing up reliably (I'm just particular about trust-but-verify :)

https://www.photosync-app.com/home.html

I have several folders in SyncThing set for one-way only sync (from one device or machine to another only, never syncing back). It's easy to set various nifty folder options in the SyncThing web UI and on the Android app. (Dunno about Apple devices, because I own none.)

i had some of these problems with earlier versions. removing the database (after making sure everything is on sync) usually solved the issue. but that's years ago.