Minibits is non-custodial. Your wallet has a 12-word seed, and backup so you can restore it on another device, or recover after a catastrophic failure. Minibits is also FOSS.
Discussion
nutstash, i keep saying nutshell on accident. nutstash IS the FOSS mint. so you are saying there is a foss web client that somehow backgrounds nwc? skeptical but ok..
With Minibits, you don't have to open the wallet to finalize outgoing zaps the way you do with wallet.cashu.me. It runs in the background via push notifications and processes outgoing zaps like any other NWC wallet. No opening the app is necessary.
You can use npub.cash and cashu.me together.
You can backup your tokens but Minibits is custodial.