Yeah, ecash is IOU-BTC tokens rather than funds.

denationalized

Yes is very interesting.
What I am trying myself when is about ecash is to avoid saying "funds".
Ecash is all about tokens, not real funds. Funds are used only when you "redeem" those tokens into a LN wallet, out of the mint.
I know, will be hard to remove from our mind this term.

DarthCoin

lightning

I've recently found out by depositing a small amount of sats to my [nutshell wallet][2] that you don't [need to backup anything else other than the mnemonic phrase to restore your funds][1]. To find out for yourself just delete `.cashu` directory and then restore the wallet from the mnemonic phrase. Your funds should still be there. The maintainer of the wallet himself [mentioned this improvement in backups on Citadel Dispatch][3]. [This is the relevant PR][4].

**Disclaimer**: That works with the wallet's default mint, i.e. `https://8333.space:3338` . I have not tested other mints. 

[1]: https://bitcoin.stackexchange.com/questions/122001/do-i-have-to-backup-cashu-wallet-wallet-sqlite3-of-my-nutshell-wallet-in-orde
[2]: https://github.com/cashubtc/nutshell
[3]: https://www.youtube.com/live/RvxSmnxcyQA?si=vnT3jw8Io9Pa7OQm
[4]: https://github.com/cashubtc/nutshell/pull/131