SQL Server take an unencrypted full backup
By default SQL will not encrypt backups. From what I see in your screenshot, the backup you're taking there, will not be encrypted either. (The option is just disabled)
A simple way would be to just use T-SQL to create your backup. ( Note copy_only unless you want to be starting a new backup chain) (and replace the folder with your backup dir)
BACKUP DATABASE DBase TO DISK = '\\Folder\DBase_20200109_1034.bak' WITH COPY_ONLY,STATS = 5

Check BOL if you need more parameters like compression.
Aslong as you don't add the encryption clause, your backup will remain non-encrypted.
Of course, feel free to use the GUI as well, aslong as you don't set &quot;Back up to a new media set, ....&quot; and click to encrypt your backups they should all be non-encrypted