There's an infamous comment on the Dropbox launch that addresses this better than I can, but I can't find it. Suffice to say: yes, I'm aware there are solutions I can put together that are more work than I care to do to maybe save some portion of $65 a year. Putting those snapshots on Drive would tear through (expensive) space fast, so I'm not sure it's a savings. Backblaze provides incremental backup for my entire SSD. Even more if I ever fill that empty bay. I don't even pay for Drive since few things I do benefit from syncing, so this would probably cost more and be worse.