Not the parent, but if you're ever looking for features to implement:

I've been thinking about this for quite a while, and one reason I've been unhappy with any sort of cloud backup solution is that they're usually too slow for laptops, unless I leave them awake while I'm sleeping.

An ideal backup solution for me would be laptop > NAS (or desktop) > cloud. A backup over the local network should be magnitudes faster, and the always-on NAS can handle a slower, versioned backup to cloud storage.

Well you could configure BlobBackup to do something kinda like that.

I know some users run backups to their NAS every 6 hours and then run a weekly backup of their NAS to the cloud using whatever NAS software it came with (alternatively you could sync it through your laptop).

Scenario == backup everything from local devices + cloud accounts/storage (e.g., iCloud, Dropbox, etc) all back down into a locally owned NAS. Use case == customer can use whatever backup whenever on whatever device, and rely on this service to hoover it all up and sync it to a big local NAS so it's all there when needed (and optionally allows deleting various cloud sync accounts or restoring/syncing cloud accts from big local NAS if needed)

Is the idea is to avoid using local resources to back up to two places, but only once to send to cloud and then handle cloud->NAS elsewhere?