It works well enough, but it's not without flaws either.

The desktop version works reliably, if you can get macOS to keep shares mounted for long enough, and mount them on request. The scheduler is also kinda wonky.

The iOS version has so far never finished an incremental backup overnight of our ~1TB individual libraries. It handles resume/suspend well, but for some reason, while it exports unmodified originals, it doesn't include AAE files, which the desktop version does.

PhotoSync does everything right, with the exception of trying to keep state of what has been exported, which makes little sense as it doesn't support restoring photos.