I use this service as well as Google Drive and to me sync is much more secure. I understand that Google has just released a security feature for sharing secure documents within gmail but I still like the way sync implements their security. The service is easy to signup for and use.

Sync.com, is another data storage service based on the cloud, but has a number of features that make it one of the best and most secure, it works on any platform, mobile device, tablet, laptop or desktop . It has a very simple interface, it is easy to use, Sync.com, it creates a folder on the device, everything that the user places in that folder is automatically stored in the cloud. You can also invite other people as collaborators, authorizing their access to the information in a very simple way, you just have to send them a link through an email, this link will allow you to see the information. You will not be able to edit it by any means. It also allows backup of information, which will not be synchronized, this function is very useful to free space in your local system, backup copies, among others. On the other hand, Sync.com, has an end-to-end encryption, which strengthens the security of information against possible attacks by people outside the company. The system can be configured, to control access to information, also keeps a record of people who have consulted or modified the data. Sync.com offers several service plans, based on annualized costs from 1 TB to 10 TB.

Sync.com has live synchronization with cloud storage. As such it does not have a desktop interface, but the web interface is very fast and can be used to move files. It has a function called "vault" that allows you to copy files without existing in the computer, very useful.