An adequate replacement for Dropbox?

Question

dropbox

Good afternoon!
We use Dropbox Business. Based on the results of six months of use - inconvenient, regular glitches and expensive - $ 75, 5 licenses. A large amount of data clogs the hard drives of computers (yes, we know about selective synchronization, but we still clog periodically).
Basic requirements for the service:
- work as with FTP - we mount and work, no mirroring to the hard disk (Win&Mac OS);
- the amount of data is 800GB for today;
- mode of use: we work with Autocad files - dwg (apparently we need an operational cache, since reading / writing is constantly in progress);
- cheaper price than Dropbox;
- absolute safety of data at every moment of time;
- the ability to roll back to older versions, restore files (not like it is in Dropbox - you restore a folder and absolutely everything that was ever deleted is restored with it);
- the ability to view through the application on mobile devices;
- I would not want to lose the ability to give links to folders and files;
- flexible system for setting access rights.

Answer 1

Many hosts have cheap rates for data/backups. Literally a couple of rubles per gig. 2 such hosters (the second for backups from the first, in another DC) and all the cases.

Answer 2

it’s not there from the word “absolutely”, but you can test it
1) Amazon (well, the same from Google and Microsoft, they will be more expensive)
2) Sync , their application is so-so, but they try
3) SugarSync was once good, but it also not cheaper
not for business usually recommend Hubic