Hy Lawrie. Assuming you wish to backup user data like apps, settings, media files and contacts but not the ROM with it. If yes, then in theory, you first need to be rooted, then install and use an app called Titanium Backup to take a backup of the said data > copy the backed up files from the internal/SD card storage to your computer through a USB cable. Let us know if we can be of further help through any of the outlined stages.
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