i edit from home, and am always anxious about losing raw video, having enough backups.  Is there a reliable, affordable Cloud service where I can store raw video - both short term and long term?

There are a number of options available - Backblaze is one that comes up a lot and doesn't have size limits.

However camera-original video is usually very high datarates and takes up a huge amount of space - uploading data to the cloud system is likely to be a very long process, and restoring in the event of loss would be equally long.

Hard drives...or LTO.