Backups in offline mode

#### Share the context

We are currently updating our osbuild stage tests [1] and ran into an issue with the OpenSCAP remediation tests. The test basically creates an image with remediations and one without and compares the diff of the two images. We noticed that `authselect` was creating backups.

#### Description of problem:

The OpenSCAP offline remediation created backups for a freshly created image.

OS:
`Fedora-38`

Version:
`scap-security-guide-0.1.68-1.fc38`

#### Proposed change:

Backups for an already running system makes sense, however, we were wondering if it makes sense to enable these for a freshly created image? Would it be possible to disable the backups in offline mode?

#### References:

1. https://github.com/osbuild/osbuild/pull/1351