Although HTCondor has long supported accessing cloud resources as though they were part of the Grid, the differences between clouds and the Grid have made it difficult to convert access into utility; a job in the Grid universe starts a virtual machine, rather than the user’s executable.
Since version 8.7.0, HTCondor has included a tool, condor_annex, to help users and administrators use cloud resources to run HTCondor jobs.
This documentation should be considered neither normative nor exhaustive: it describes parts of condor_annex as it exists and is implemented as of v8.7.8, rather than as it ought to behave.