Storage seems reasonable, maybe even a bit too cheap, but the sync minutes look way too expensive. One problem is with end-user monetization: users are used to pay for storage, but not for how much time they can use your app.
For a small storage-heavy indie app I have, I'd pay $79 for base price, $45 for additional storage, and $1500 for sync minutes.
Random one, but how do you find using Cal - Im keen to try it out?? I saw it on Onestack.cloud hosted for A$10 per 10 users per month which is pretty decent - our startup has a few founders and are pre-revenue, so means we couldn't really afford per user per month.
Either locally or on your server.
And then point the app to that!
Edit: re pricing
Super preliminary, curious to hear everyone’s thoughts