Sadly Linux users are like 1% of the market, non-ext4 is even less (and I am a full-time Linux user and big ZFS fan). They actually restored support for several non-ext4 filesystems over a year ago[1].

1: https://hub.packtpub.com/dropbox-walks-back-its-own-decision...

OneDrive has been absolutely rock solid for me (even on a Mac)

Syncdocs has been working reliably for me for years. They seem to focus on the core file-syncing stuff, which works fast and reliably, rather than blingy features.

I'm very happy with Tresorit - https://tresorit.com

I loved Tresorit but it's camera upload feature didn't transfer files correctly from my wife's iPhone - it left them corrupted and unopenable with no warnings or errors whatsoever.

Unfortunately because of that alone I dropped them completely. I'm using Dropbox now because I haven't found a better alternative for syncing between iPhone/Android/Windows/Linux.

what things that you need synced

It's quite expensive though

Yeh true but as an other example Dropbox missed out on the privacy and end to end encryption market.

My use case maybe different from yours but GDrive has worked well for me.

The others are generally not supported on Linux. Dropbox has a cli client here that mostly works. At least if we are talking Google/Microsoft. Or the companies are small enough to go under overnight and leave me in a lurch

If long-term is your game and you don't like the big boys, you should probably look into Syncthing. Being an open protocol, it will never go away.

Google drive unofficial client works pretty well for me on Linux.

There is a difference between official and unofficial support. Also, Dropbox is big enough to be around for a while, but this is their product and if it goes south, so do they. I don't trust Google to maintain any product before rebranding, pushing the work to the users, or dropping the product. They have shown otherwise.

Insync works well for Google Drive on Linux.

It did. Recent versions add the suffix xml to files with xml contents, unfortunately.

Have a look at Syncthing.

Syncthing is solid. Maybe a little too geeky for most, but for tech-minded people it can really work. I've had little issues here and there, but it definitely solves some problems for me.

I generally use Dropbox for personal files and Syncthing for business. It's a great setup to keep those things separate.

Secure access over the internet is a limitation of self hosting.

Box seems to be taking some of the enterprise market share.