(read-write) Which API to use for the cloud:
<programlisting>
S3 Amanzon S3 api
- SWITF-1.0 Openstack swift v1.0
+ SWIFT-1.0 Openstack swift v1.0
SWIFT-2.0 Openstack swift v2.0
+ OAUTH2 Google
+ CASTOR Caringo CAStor
</programlisting>
</listitem></varlistentry>
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