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SD backup FAQ added

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kn0wmad
2021-04-14 15:17:31 -06:00
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source/support/FAQ/usage-faq.rst
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@@ -52,6 +52,18 @@ Do I need to delete existing backups before doing a new backup? Or does a new ba
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No, you don’t need to delete the old backups. The technology we use updates the existing backup.
Can I clone my Embassy SD card for backup purposes?
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It is absolutely possible to do a deep clone of the card as a backup if you wish to do so, but there are some considerations when it comes to this. First off, we don't test/support that officially; it doesn't get nearly the same level of attention that the backups feature *within* the Embassy does. Secondly, it may take a while to do a deep clone of the card since the ones we ship are 128GB and there isn't a really effective way to clone the Embassy card that isn't a byte-for-byte copy. However, if you do a byte for byte copy (128GB), and run pishrink you could flash that image file onto a new card and restore all of your data.
Another thing that must be mentioned, depending on what services you are running, if you are going outside of the Embassy backup flow you should be deeply aware of the implications of restoring backups. For instance, with LND it is *dangerous* to have multiple instances of the same LND node running at once because it can cause your channel funds to be completely lost. So while it would be safe for LND to restore the SD card if the original copy was completely offline, you should be aware that if it isn't offline you can lose all of that money.
This is not just if you run two embassies. It can also happen if you conduct any lightning activity including letting the commitment fees update. The embassy backup system informs each service when it has been restored through the backup flow so that each service can respond appropriately how it sees fit. At the moment LND and c-lightning both respond to this by deleting their dangerous state. If you restore with a deep clone of the sd, this information is not included and so LND/c-lightning will unwittingly expose themselves to channel fund loss.
And to be crystal clear, commitment fees update without user action.
So all in all, if you are running lightning, we strongly advise that you DO NOT DO THIS.
Why would I even buy this when I can just build it for free??
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(1) White glove support. Because each Embassy comes with a unique product key engraved on it, and we have a record of all product keys ever, we can ask the user to verify their product key in order to receive a higher tier of support, such as phone calls.