Not that I am aware of.
So this would imply that if I had two C4 hubs kept reasonably current on firmware, only used one(#1) and stored the other(#2), in case of a major crash on #1 I could rmove its stick, download the latest backup from #1 to #2, plug #1's stick into #2 I would most likely be back on line? (maybe with some rules lost but all devices accessible.)
That would be great!
If your hub was dead, you would not be able to get the backup off it. You would have to download the backup periodically There are many, MANY posts walking you through how to do that. You would not need to keep the C4 firmware updated. You would update that when you first pulled it out and set it up.
All of your devices and automations should be restored as long as you use the same stick and go from C-4 hub to C-4 hub.
I was thinking of keeping them mostly around same firmware revision. Create a new backup just before major update. Then use #2 in-case I did something stupid resulting in a non responsive hub #1. (I know the odds are very low but it seems to have happened to a couple of users in last round of updates) Getting a second hub operational for me would be cheap insurance. Probably never use it for this but could be used as test hub as well.
That is not the recommended way to recover from an unresponsive hub. Anything software does to the hub, software can recover from. The releases we are getting are tested. You would have to roll back to previous platform version and then to a previous database copy but you would not want to swap hubs. This is not the way to go about backing up.
Z-wave yes, zigbee no.
There is a tool from aeon labs that can backup/restore the z-wave stick using a pc.
I have sucessfully used the aeon labs tool to ācloneā my zwave stick and it worked perfectly for me.
Iāll try and dig out a link today for you.
Iām in the UK so also have a C4 with ādonglesā too.
My disaster recovery would be to take the dongles, put them into a new hub and restore a backup.
(I have scripts that auto backup to a pc every day)
This is something I have tested and know it works.
The only thing I canāt do is restore any zigbee stick data so would have to join all my devices to a new zigbee stick should it fail.
Andy
Poor cat 
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Would it be possible to automatically upload backups periodically to a cloud storage provider (Dropbox, OneDrive, etc ?) with a Hubitat App ?
With an HE app no.
However you could easily do it with an external script running on a pc somewhere
Andy
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I found a link to the backup/restore tool from Aeon Labs..
https://aeotec.freshdesk.com/support/solutions/articles/6000108806-z-stick-gen5-backup-software
Andy
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Yes, I think that would be easy, but one is always trying to keep things as compact as possible and not rely on another device that may fail.
Thanks for the comments, I like the idea of script auto backing up db. So the big problem remaining is zigbee stuff. I've got a bunch of those as well. Out of curiosity, has a hubitat hub ever fully failed?
You can easily make manual backups and move them to Dropbox etc. As long as you make backups after making changes to your setup you don't need anything complicated.
I have an Aeon stick paired to my HE C5 hub. I have that stick connected to a Linux machine running Open Zwave Control Panel. I can shut down the HE hub and still control lights through OZWCP.
But keep in mind this is a bit easier than having to re-join Z-Wave devices. For Zigbee, the hub remembers the Zigbee device's factory-set MAC address, and it will use that to put it back back into place as the existing device (just with a new DNI), also keeping it in all your apps/automations. The only tough part is re-joining them all. For Z-Wave, it could be easier if Hubitat supported the Z-Wave "Replace" feature, but as-is, the hub/stick will assign the device a new node ID and you will indeed have to switch that device out for the "old" one in any apps/automations manually. Luckily, as you noted, if you have a Z-Stick, there's a backup tool, so this should be avoidable.
If you're in North America or elsewhere with an HUSBZB-1 for Z-Wave, I'm not sure what backup options exist for that (can OZWCP or the Z-Wave tool Zooz provides for OTA firmware upgrades do something similar?). And obviously the internal radios on a C5 complicate this. But also luckily, Hubitat has also stated that network backup/restores are on their radar--we just don't know when. In the meantime, I've never been to worried about Zigbee, and I'm feeling a lot better about Z-Wave now that I decided to switch to a Z-Stick that I'm able to back up. 
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If I only had a US combined stick, I would add an aeon z-stick to it
I would think itās possible with a C5 hub too, but donāt know for sure.
Andy
Yeah, since I bought a second (OK, third) hub for Zigbee and lighting, my first hub was basically only doing Z-Wave. Since that has been working well for a while, I decided now was a good time to re-do my Z-Wave network from nothing and switch to a Z-Stick while I was at for the added benefits. 
(If any new users find Z-Wave backups important and don't wait to wait for whatever Hubitat will probably eventually provide, I'd advise that starting with the Z-Stick in the first place would, of course, be the easier route. You can connect one to a C5--see below--or use it on a C3/C4 with or without the HUSZB-1 which will be relegated to Zigbee in that case. Or you can be like me and re-pair all your devices when you make this decision. Ha.)
You are correct! Staff have recommended a "Y cable" like this one if you want to use an external radio with the C5, which you'll need since there's only one (micro-)USB port. I haven't tested it myself since I ended up re-using my C3 with the Z-Stick, but something like this should work: https://www.amazon.com/gp/product/B079J5MWYY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 (US Amazon link)
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When you get a chance can you please link to where this is stated, I would be very interested in reading the thread.
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It's been mentioned a few times by staff (and others), but the first was in Bruce's post announcing the release of the C5: Hubitat Elevation Hub Model C-5 Released
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Thank you
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