this app is the only cloud storage company that I trust with my personal documents. Day by day there are large-scale attacks on many companies resulting in account usernames, passwords, and data being leaked, scanned and sold to the highest bidder.
Other online storage providers such as Google and Dropbox scan your files and have the ability to see everything you store. I know that this app has my back and that my files can not be accessed by anyone but me.
It has perfect zero-knowledge security, and supports all the security features you would expect, such as 2FA, login notifications, etc... But what makes them really stand out against all the others is their use of client-side encryption, meaning that unlike their competitors, your files are encrypted *before* they're uploaded to the cloud - so no one, not even this app themselves can see your files, because only you hold the key. Syncing across multiple devices also works flawlessly, and file upload speed is very fast. Their encrypted-link sharing features with the options of adding a password and limit the number of downloads is a huge plus. I've used and trusted this app since they launched in 2013 and highly recommend them.