Windows 10: backup one and restore to a new apps, settings, including registry

My computer has had multiple problems so HP is sending me a replacement. The replacement should be essentially the same system this time with working USB ports. My system required a registry fix to get the storage correct and I have a few apps and some system settings such as outlook. The system is a Windows 11. Can I use windows backup to save all my settings outlook, app registration, etc. and my registry settings or do they have to be done differently? Doing a complete reinstall is possible but frustrating since I have to inform the vendors with the software I am not making multiple co

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How to backup and restore registry using only win10 iso command prompt

In a link it suggested several registry troubleshooting steps for a Windows with black screen.

For Windows 10 1909 how do you backup and restore one registry change using a windows 10 iso command prompt?

If more than one registry entry is modified how do you backup and restore a second change?

In addition to modifying one or two commands how do you backup and restore the whole registry when the only access is via a windows 10 iso command prompt?

 

How to backup and restore registry using only win10 iso command prompt

The only access post windows upgrade is Windows RE using a windows 10 iso.

Registry steps may be needed that require deletion of the registry entries.

Aren't there two methods for backup: a single change and the whole registry?
I've never done either and need specific steps using Windows RE command prompt.
Also I've never restored a registry backup.
How do you restore a single backup using Windows RE command prompt?
And how do you restore the whole backup?

Again I've never done any significant changes in the registry and need specific steps using only the Windows 10 iso.

 

Backup did not restore

My Microsoft account previous Lumia (630) backup did not get restored on anew Lumia (650). I have properly logged in at the initial start of the new device, but did not see a list of backups to restore from. All SMS, settings, apps list are missing. Did
Microsoft delete my backup?