Can SD! back up to a cloud drive?

[Irl]

I need to make offsite backups of about 250 GB of photos (mostly it's just three High Sierra .photoslibrary files). I have tried Apple iCloud but it seems wonky and/or unreliable. Is there a cloud service that SD! can treat as an external drive for a ~weekly smart backup (that doesn't require copying the whole thing from scratch each time)? Otherwise, is there a recommended way to accomplish this? ARQ sounds good from what little research I've done, but I'm new to this.

[dnanian]

Have you considered just using Backblaze?

[Irl]

I hadn't, but now that I have looked at it it looks promising. Thanks for the suggestion! (I gather that the answer to my original question is that no, SD! is not designed to use a cloud storage area for the backup.) (I'd prefer to use SD! since all the infrastructure is there, but it appears BackBlaze is pretty painless and transparent.)

[dnanian]

Yes. It's really designed for this kind of thing, with a client/server infrastructure setup, unlimited storage, unthrottled transfers, and quite cheap.

This URL'll give you a free month: https://secure.backblaze.com/r/019sut