Add support to export backup to s3 compatible storage

[remyleone]

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Is your feature request related to a problem? Please describe.

I would like to backup my volumes to a s3 compatible storage solution

Describe the solution you'd like

I would like to put my credentials in a configuration file, the extensions would configure itself to send the backup to a s3 compatible storage (not necessary on aws, it could be a minio for instance)

Describe alternatives you've considered

Upload with SSH but it is not always practical as server got a limited amount of resources

[saroberts]

So I have a very similar issue, but not specifically related to user data. It appears that when machine copies the ssh key /home/demo/id_rsa to the machine location /root/.docker/machine/machines/vm/id_rsa it also generates a public key /root/.docker/machine/machines/vm/id_rsa.pub. Somehow it is that public key (either the permissions or simply its presence) that interferes with the ssh.

I don't have a solution to this. Have you found one in the past two years?