| mail.ru | 100gb | https://e.mail.ru/signup?from=login&lang=en_US |
| yandex | 10gb | http://yadi.sk/ |
| box | 10gb | https://box.com |
| pCloud | 20gb | https://www.pcloud.com/ |
| HubiC | 25gb | https://hubic.com |
| dropbox | 2gb | https://www.dropbox.com |
| mega | 50gb | https://mega.nz/ |
| amazon | 5gb | https://www.amazon.com/clouddrive/ |
| OneDrive | 5gb | https://onedrive.live.com |
| HiDrive | 5gb | https://www.free-hidrive.com/ |
| baidu | 5gb | https://pan.baidu.com |
| mediafire | 10gb | https://mediafire.com ( -> 50gb) |
| backblaze | *unlimited* | https://www.backblaze.com/ |
| TeraBox | 1TB | https://www.terabox.com/ |
| FilesFM | 5gb | https://files.fm/ |
| blomp | 200gb | https://www.blomp.com/ |
| sberdisk | 15gb | https://sberdisk.ru/en |
OCT2018 - https://www.techradar.com/news/best-cloud-backup
MAR2020 - https://www.techradar.com/news/the-best-cloud-storage
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useful client applications
https://www.duplicati.com
https://rclone.org/