it's way better for Cashu wallets to store their ecash offline in a durable database instead of nostr relays. NIP-60 is double trouble: mints can rug you, relays can rug you, and you can fuck up your wallet configuration. avoid if you can.
nostr:nevent1qvzqqqqqqypzq77777lz9hvwt86xqrsyf2jn588ewk5aclf8mavr80rhmduy5kq9qydhwumn8ghj7argv4nx7un9wd6zumn0wd68yvfwvdhk6tcqypalt2y4sy0hse7ff2naar94n0r2rspnchzc539rv2096g8k4du766gmuq4
I see NIP-60 as a sync additional tool, it doesn't prevent a sovereign backup procedure.
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Safebox?
Backups in 5 relays are probably safer than on 2 relays and your hard drive. Just make sure it remains 5 over time.