ADrive may not be very well known but it offers 50GB of free cloud storage which is an amazing deal. Along with this there is a small catch. The catch is being advertiser-supported platform so you can storage a lot but you also get the ads that come along with this.
100GB plans start at $2.50 per month or $25 per year.
Along with this it offers sharing and backup but its business and enterprise account offer encryption and multi-user access.
iCloud on the other is very well known for being an Apple product. iCloud is offering 5GB of free storage. Beyond this, there is Bitcasa offering 1TB of storage for $10 per month or the 10TB for $99 per month or $999 per month.