1GB for Images, and 5GB for archieves.
Nope.
Images will never be deleted automatically, but in rare circumstances we may delete them. Archieves are deleted after 7 days.
Share 'N Do! is a site for sharing. All things uploaded receieve a link that anybody with the link can see. We may routinely screen uploads for illegal content and may share any upload to a third party.
At the moment, an email to support@sharendo.io is the best method.