an idea about upgrades

[jd1008]

On 05/13/2015 01:22 AM, Michael Schwendt wrote:
> On Tue, 12 May 2015 11:53:38 -0600, jd1008 wrote:
>
>> It would be a great idea if Fedora would provide
>> a way to downgrade to the immediately previous release
>> (from which the upgrade was performed), if the user
>> decides (for some reason) to return to the previous
>> release. This would completely obviate the need to
>> do a backup, and restore - especially for a 1TB or
>> more drives (I have a 4TB drive, for example).
> Most software doesn't look back and only adjusts runtime files to the
> new version you run. Not limited to config files and settings, it can
> also be a migration to a new storage/database format. Same for RPM
> packages. If at all, they contain triggers/scriptlets that move forward.
> Downgrades of such packages would be a completely unplanned and
> unhandled scenario.
Is that a red herring or can you provide examples,
say for downgrading from 21 to 20?