Will this Setup Protect My Data Files from Malware (e.g. Ransomware)?

Will this Setup Protect My Data Files from Malware (e.g. Ransomware)?

I set up an external drive for data backup (an SD card inside my laptop card slot). In addition, I connect with a cloud drive for offsite backup (an app that I run only when syncing files).

I always sign in and use my laptop as a 'standard' user. My external drive is set for UAC 'read' privilege only.

I then set my data sync app to run as admin only - meaning I need to type in the admin password before data can be synced to my external drive and to the cloud.

Of course I will remain vigilant about keeping OS and apps updated and avoid clicking email links or downloading unsolicited payloads,etc. -- but in case I miss something and a ransomware comes through, will my Win 10 system stop that ransomware from encrypting my external drive?