The best replacement for amazon s3 is rackspace.

The best alternatives to amazon s3 are rated as following:
★★★★★  rackspace
★★★★★  crashplan
★★★★  google cloud storage
★★★  google cloud
★★  hdfs
★★  carbonite
★  akamai
★  rackspace cloud files
★  microsoft azure
★  mozy
★  google storage
★  wistia
★  maxcdn
★  rackspace cloud
  dedicated server
  cloudflare
  vimeo pro

Your alternative for amazon s3 is not listed? Suggest!
Speaking about amazon s3, one probably shouldn't forget about paperclip.

Other search terms related to amazon s3 and their ratings are:
★★★★★ paperclip
You have in mind a companion for amazon s3 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of amazon s3 in all years. Click on graph for more.
amazon s3
rackspace
crashplan