Related to #481, which does give you a bit of an outline of what to do but we know is not a full answer or solution.

Can you give me a little more context of the kinds of storage platforms you are thinking of? Maybe a couple specific examples of these less common data platforms?

labkey is one such platform. Using labkey API, one can store files, very much like writing a CSV to S3. Forking the older version of pins, I added labkey as a board which enabled pinning to labkey. I'd love to be able to do something similar with the latest version pins.
Hope this context helps and thanks for looking into this!

It looks like you didn't need to write new S3 methods (if I remember right, they were things like board_pin_create, board_pin_get, and similar) but instead made a special/specific version of the datatxt board? I unfortunately am not too familiar with the datatxt features of the older version of pins, as I never worked with that.

We do have examples of using existing boards in this way still, like using board_s3() with MinIo storage or the thin wrapper that is board_connect_url(). Do any of the existing boards look like they would work for labkey?

If not, I think then you are in the situation of creating all the needed S3 methods for your new board, as outlined in #481. The good news is that each one is pretty small, but the bad news may be that there are a fair handful that need to be made. If that's the situation you are in, would you be interested in taking a stab at the process? If you are interested in contributing that needed documentation about how to go about this (a new vignette), we would welcome it! If not, I will keep an eye out for other users who are in a similar situation to prioritize the new vignette.

That's right, datatext class was used making customization very convenient. I'll take a closer look and see if one of the existing boards is generic enough (as data text was) that could accommodate. If not, following #481 sounds reasonable and thanks for being open to PR and new vignette!

Let us know if you have questions as you work through making a new board type! It would be great to collect feedback on that process for documentation purposes.