Looking for an alternative to UbuntuOne, I found that the official Chinese distro, Ubuntu Kylin, has announced a cloud service from Kingsoft KuaiPan, with its own "customed app". This sync client is only partially translated into english, but it was quite easy to get 1TB extra: 512GB installing their apk in my Android phone (which I uninstalled as soon as I got the extra storage) and 512GB binding it with wechat (a service I don't use anyhow). It is no doubt a generous amount of free space which derives mainly from a cloud storage war in China.
Apart from a slight memory leak, I must acknowledge how well this service integrates in Unity. A screenshot of the KuaiPan folder in Nautilus (note the Ubuntu logo):
Provided that Canonical somehow endorses this service, I can imagine that it is reliable at least to some extent. My natural question is to what degree? Of course, if I were paranoid, I wouldn't share any personal file on any server beyond my sight. However, I'd like to know
if KuaiPan provides end-to-end encryption; and
how this service handles storage and files (i.e. if they have a “master key” to see/open them)
In case they don't offer a secure connection, please let me know if there is a way to take advantage of this service, for instance, using it as a backup protected with password.