And that's a low barrier. The Dropbox client is totally flaky with me. I've never managed to get it to sync my files, because I have too many I guess? I just used rclone to get everything out of my Dropbox so I can close it.

I've synced terabytes with Dropbox no issue and know others doing the same. All others cloud sync products I've tested are much more flaky. Google drive was the worst and had many issues supporting others who decided they must use it.

Not sure what your dropbox issue is but I'd check you have the latest client, check you have granted file folder permissions to the app if using macos. First sync takes a while but performance is good after the first sync.

Sadly I tried pretty much everything. It was the newest version, no previous versions installed. I had 2TB of data, but it was hundreds of thousands of small PDFs.

I've also used One Drive, GDrive, IDrive, Mega and some others. All of them have different issues. I guess I hate One Drive the least, but the barrier is low.

I hope you verify file existence and integrity using a third party tool instead of blindly trusting the syncer or eyeballing it.

Use rclone to grab them instead.