I don't like being pedantic, but a sync'ed copy isn't a backup. It might protect against hardware failure, but it won't help against accidental deletion or corruption.
I'm not sure if GDrive has file versioning/restoration built into it or not, but there is an important distinction to be made here.
I'm not sure if GDrive has file versioning/restoration built into it or not, but there is an important distinction to be made here.