Electrum trampoline lightning funded but 0 can send and receive

[Cricktor]

It's true that we're speculating. I assume that charlie574 maybe reset his Windows computer to some previous restore point and maybe this restored also his personal data files into an inappropriate state of time. But frankly I don't know exactly. In the Github issue thread he states that he has reset his computer and has used whatever exactly wallet file he backed up or hopefully saved before the reset.
The statements are not accurate enough to judge properly and there some details that down sort out.

There's likely a lesson to learn but unfortunately it's too messy in my opinion to draw a line.

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[Saint-loup]

In this thread you missed out some important information, particularly that you reset your computer and restored your Electrum wallet from some backup. The restauration of active Lightning channels is a difficult and cumbersome story.

There might have been some bugs in Electrum which were fixed with patch 90dbac5 for such an edge "mess".

Good for you, you got your funds back. I don't want to be picky but I find it disappointing when an issue is so poorly described with lots of omission of details that surely are relevant for assistance and the issue itself. I understand that a user might not be aware of important details as the awareness is proportional to knowledge on the topic.

Oh well, what matters: not all Sats were harmed and lost, only a few of them.

So what is the good procedure when we want to back up a wallet in order to transfer it to another computer or to upgrade our OS? Channels have to be closed necessarily? Or there is a way to "transfer" them too?
Because when we use File > Save backup we get this warning message :

[nc50lc]

-snip-

So what is the good procedure when we want to back up a wallet in order to transfer it to another computer or to upgrade our OS? Channels have to be closed necessarily? Or there is a way to "transfer" them too?

If you need to transfer it to another or upgrade your PC, you'll just have to copy the wallet file from the wallets folder in the data directory.
But make sure not to make a transaction on the original before opening the copied wallet, it's recommended to delete the old wallet after successfully loading the wallet to the new/upgraded PC.
There should only be one "active" copy of your channel(s) or there'll be consequences if you accidentally spend from the outdated copy.

Using the backup option will just copy a "static backup" of the channel to the backup wallet file where the only option is request to force-close.