Can I migrate just 1 app to C-7 hub vs. a full migration/restore?

Correct.

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That is correct for both local backup, as well as cloud backup under Hub Protect.

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That sounds like a good plan. So did you end up having to manually add the devices and apps to your C-7? I've tried using Hub Mesh, by selecting just one device to sync. It then shows up on the C-7. But when I turned off Hub Mesh on the C-7, it greyed out and wouldn't let me save it.

Bummer, but that's what I anticipated.

Is there a way to use Hub Mesh to accomplish this?

Yes but I could take my time with the migration so that helped.

I'm not sure I understand this - you set up hub mesh on the C-7 and expose the devices you want to the C-4, on the C-4 you use HubMesh and choose to get devices from the C-7.. they should just show up as devices on the C-4.

OR the reverse of that - expose C-4 devices to the C-7 ... or both

https://docs.hubitat.com/index.php?title=Hub_Mesh

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Think of Hub Mesh as a bridge between two hubs. You can share devices but not apps. With mesh networks such as Zigbee and Z-wave, the more devices you connect to one radio, the stronger the mesh becomes. Also running two mesh networks (or more) in parallel in the same home, increases the chance of radio interference, which can weaken both networks causing devices to work intermittently or stop working altogether. My recommendation to you is to bite the bullet and bring your 19 devices over to the C7, then rebuild your 11 apps.

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I exposed the C-4 devices to the C-7 and they showed up. I added them individually using step 6 in the linked doc.

Ah okay sorry you were referring to the "hub mesh enabled" option on the device property page.

NOTE: To link to the shared device, you will use the Link to remote devices drop-down list on the hub where you want the linked device to be available as described above in Step 4 .

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Sorry for my ignorance, but I'm struggling with how do I "bring the 19 devices over to the C7". It sounds like I'm missing something obvious.

Yes, I was trying the "hub mesh enabled" option.

Exclude/include for Z-wave, reset for Zigbee.

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Another thing to consider for the truly aspiring and addicted techno-geek - if you want to keep things separated even after migration then consider a multi-hub arrangement. There is a sale going on apparently :wink:

I just picked up 2 more hubs myself...sigh..

My current setup is a C-5 for Zigbee (and temporarily for cloud/network devices since my C-4 died ) and C-7 for Z-Wave. Another great option is by location - my original multi-hub was 2 C-4s, one for the main floor & basement and the other was for upstairs. This was nice because I could bring one hub down without affecting the other (except for shared devices of course). Rules and such stayed local to each hub for the most part.

edit: in all seriousness having a backup hub (and periodic external backups) is a good idea if you are planning on keeping this system for a long time like more than 5 years or so. No telling what direction Hubitat Inc will take in the future and having one on hand can help mitigate any major changes.

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Yeah, I saw the sale and it's pretty tempting.

I think technically I have a multi-hub arrangement, since both the C-4 and C-7 operate independently. Currently, though, it's a mishmash of devices/apps. It would be nice to come up with a logical structure, once I figure this out, or as a backup hub as you suggested.

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Migrate devices manually. It’s the only option available for the devices in your case. You won’t regret the move unless you’re running old Z-Wave devices that cannot be included to a 700 series Z-Wave radio without using S0 security.

For me, it was a bit of work to move, but really worth the effort. Things are very fast and stable.

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Thanks ... That sounds like what I'll have to end up doing. I'll just do it gradually. I'm not sure about whether they're old devices. I guess I'll find out, though.

Something you might want to consider is picking up an inexpensive UZB-7 that you can pair as a secondary controller.

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That sounds like a good idea. I'll have to give it a try.

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If you own a Mac not a PC check out this post..

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Cool ... Although, I'm in the PC camp.

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I'm "platform fluid" having both a Mac and a PC... sometimes I identify with one sometimes the other.. :grin:

(with apologies to anyone going through gender identity issues, do not mean to make light of that potentially difficult situation)

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