nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqwc4rc9wxl2gfzxl384g0cw3f79nrms0sfdpe02y7aasy7c3we4sq3w3825 2FAS and Ente seem to be the best options.

2FAS offers iCloud backup/sync, but it can be disabled.

Ente can be used with an account for backup/sync, but it isn’t required. You can choose to use the app without an account and backup manually.

The last time looked at them, I leaned toward 2FAS as my preferred option.