With nos2x, you could use your password manager to backup your key. Or just go crazy and no not backup. Either way, alby may store it in the #cloud. Is all.
Discussion
This is not true. Alby extension is FOSS just like nos2x and it absolutely does not upload your nsec to the cloud. It's just as much of a nostr NIP07 signing extension as nos2x
Ok thank you for confirming that. Ya I was #lazywebbing that one 😎 but also, to make an alby acct need email, whereas nos2x does not
Alby stores your Nostr keys only locally on your computer: https://guides.getalby.com/alby-guides/alby-browser-extension/features/nostr