I'm not a business, I'm a paying customer on the most expensive personal tier. It's silly that they don't offer this feature for me. I also can't upgrade to a business plan because those require at least 3 users.
It just feels like feature gatekeeping to me, but no way for me to pay more to get this feature. But I also understand that personal users are not Dropbox's main focus.
We all are probably guilty of falling for the convenience trap here or there.
But setting up the sync between Dropbox and the NAS (Synology user here) with a one-way, don't delete, don't overwrite policy is a good lifeline to have - you know, just in case...
If you want encryption enough, you can probably pay for a three-person business plan and just not set up the extra users. Looks like it would double your monthly subscription over the most expensive personal plan.
It just feels like feature gatekeeping to me, but no way for me to pay more to get this feature. But I also understand that personal users are not Dropbox's main focus.