IPad M1 "Reset" to wipe my Backup Encryption Password (?)

Hi all !

I want to edit my iPad Air M1 Backup with a 3rd Party App ie: Imazing.

It backs up my iPad and makes an editable and restorable image" of my backup no problems.

The Problem ?

When I go to edit it, it asks for the encryption password.

I have no idea what password [if any] I used - so I cant do the editing and selective restoring I want to do.

So I did some Googling and found the (a) "Reset" and (b) "Erase All Contents and Settings" options.

I know (b) is a full factory wipe and reset to new in the box - I dont want that.

My Question ?

Will (a) ... "Reset" ... allow me to make a new iCloud Backup that is unencrypted so I can use Imazing to edit and restore all or bits of it as I please ?

And will it leave all my Data, Apps etc.... untouched and running ?

Thanks,

Ben