What is the alternative to Dropbox?

Question

Backup

Please tell me an inexpensive alternative to Dropbox.
After version 2 (for Mac), dropbox significantly slows down the computer, constantly accesses the disk even in the absence of any activity (reinstalling the program and the entire system did not help).
Actually, cloud storage is required:
- volume of 200-500 GB
- good upload/download speed
- iOS application
- convenient file sharing
- versioning support is desirable
- minimal resource consumption
Purposes of use:
- synchronization of work files between two computers
- backup
- fast sharing
In advance thank!

Answer 1

BTSync plus NAS for it at home, for example, where there is fast Internet. If one car is also at home, then the connection will be generally direct, without any of these your Internets. There are practically no volume limits. But sharing with the left people can be difficult - it will be necessary to install the client before downloading.
Fast, convenient, flexible enough, if earlier dropbox was enough.

Answer 2

Yandex.Disk, Google Drive, Bitcasa, SugaSync, One Drive, Ubuntu One, Box - in general, you can list for a long time. These are the main ones.