As I use DEX mode more. My note 9 is becoming my pocket computer for everyday computing needs. Backing up my phone like a computer to a external harddrive. Without a cloud service. Some information on a cellphone/computer you do not want on a cloud service.
How can I back up my cellphone. The internal and sd card data to an external drive with out a computer. If I ever need a replacement phone from being lost or damaged.
Depending on the model, your phone should have a backup feature in settings>accounts and backup>backup and restore...
Backup SD card contents via Google Drive by uploading yoru sd card data to a folder