You do want online storage. However, I feel better with an external drive archive, too. Note that this drive should never be connected to your online computer, ONLY to an air-gapped computer (due to ransomware that can encrypt external drives - and perhaps online drives - too.) In theory you need to use a fresh USB drive for every transfer to the airgapped computer, too, due to Windows vulnerabilities that work even if executing USB files has been turned off in the air-gapped machine.

We very badly need external drives with a hardware switch that turns off overwriting or deletion, with the possible exception of the last file accessed. (So maybe two switches.) Such a drive wouldn't be so vulnerable to ransomware, and you could drop the air-gapped computer and keep it plugged into your main computer for convenient or automated backups.

If someone would like to share a patent on such a device, lemme know.