ADrive:
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:
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.
