Hi Bruce.
If you are backing up your data, and this data matters to you, please look into the 3-2-1 rule.
3-2-1 rule
3 copies
2 mediums/devices
1 offsite
lets use pictures as an example.
you have the photo on your device. then a duplicate copy of the photo in another folder. and another duplicate in google cloud. that would fulfill the 3-2-1 rule. 1 offsite is a bit much for personal use, and its expensive, because it implies cloud storage.
it is to cover for a "what if a tornado hit the building" scenario.
i would recommend purchasing a Synology NAS and let it be your primary source of off device backups. might be a bit expensive, but they are essentially plug and play, and have software that makes what you're trying to do a non-issue.
the part people don't talk about with backups is testing them. at one company i worked with, they claimed to have backups on X and Y interval and scope. first backup i tested out of curiosity was a complete failure after a 3 hour restore attempt. extremely
concerning, considering its what made their bread and butter. what good is a backup if you can't trust it? have a routine of testing your backups and process. data is cheap until you lose it.
also, i really would not recommend relying on external SATA USB drives for anything but convenience. they are not as fickle as a flashdrive, but not far off. definitely have an off device backup of whatever is on those.
just my two cents.
Seth