I've recently found out by depositing a small amount of sats to my nutshell wallet that you don't need to backup anything else other than the mnemonic phrase to restore your funds. 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. This is the relevant PR.Disclaimer: That works with the wallet's default mint, i.e.
https://8333.space:3338
. I have not tested other mints.