Can I use my own images?
Yes, all users can upload and use their own images. Please note that uploaded images incur costs and will be billed accordingly. It is also important that the images are prepared for usage in a cloud platform - see https://docs.openstack.org/de/image-guide/create-images-manually.html for more information.
I am using a public (Linux/Windows) image and would like to log in via SSH/RDP - what is the username?
The username depends on the distribution used. Details can be found in the table under Services -> Images.
Can images also be downloaded (e.g. snapshots for backup purposes)?
Yes, but images can only be downloaded via the CLI:
glance image-download --file <filename> --progress <image-ID>