Recs.
Updated
A New Zealand based cloud storage provider. Basic users get 50 GB of online storage, which is completely free.
SpecsUpdate
Pros
Pro Multi-platform support
The user can access the stored files or upload new files using the browser. Additionally they can use their phones or tablets (Android and iOS devices). On windows MegaSync is provided for automatic backup and safer file access. To further improve access security, there is also an extension available for Google Chrome.
Pro 50GB free
50 GB trial for new accounts after registering for a month, then 15 GB. There's also three upgrade plans, starting at 500GB and $110/yr. 15GB may not seem much, but Dropbox only offers 2GB for the free plan. This is better than Google Drive because Google Drive storage is shared with all the Google services you are using.
Pro Free 50 GB of storage
Everyone with an account will get 50 GB of online storage. It is a simple sign up, just a minute's work.
Cons
Con Has a transfer limit
Both for free and paid accounts, there are monthly transfer limits. That is, the user can only upload/download a certain amount in one month. For instance, it is 10 GB/month for free users. The transfer limits, maximum and current can be viewed in the user's account page.