Backing up an Electrum wallet I have just installed an Electrum wallet on my Ubuntu machine, and transferred some funds into it.  I wish to back up the wallet, so if my computer is dead or stolen, say, I will be able to install Electrum again and restore the wallet.

(In fact, it would be best to be able to restore the wallet from other software, not necessarily Electrum, if that's possible).

My wallet has a name (btc1) and a password. After opening it, in the wallet menu, I have the seed option grayed out. I am able to export private keys, however. If I understand correctly, the wallet itself is located in the file ~/.electrum/wallets/btc1. If I copy that file, say, to a different machine - then the wallet is also there?

I'm a bit confused about all of that.
There are 3 approaches to backup/restore your Electrum wallet with Bitcoin, depending on whether you use Electrum to manage a HD or non-HD wallet, you may or may not have a 'seed'.

If your wallet is a HD wallet, to restore/backup your wallet, simply use the 'seed' (12 words).

If your wallet is not HD, to restore/backup your wallet, simply restore/backup your wallet via private keys.

If you don't know/care whether your wallet is HD or not, simply backup (save a copy of) the whole Electrum wallet's data file to you USB drive and move it to another computer. You can use Electrum on other computers to open the data file.

I wrote this 3 Approaches to Backup Electrum for your reference with some screenshots in more details. Hope it helps.