Oh good point! I’d forgotten about that - it’s so long since my own new backups finished and cleared out the old ones. Yeah, once that new backup finally finishes, there’ll be a lovely purge of the old CloudKit backups, freeing up massive space.
The new update is already in the App Store review queue, in “Waiting for Review” status. Usually that only takes a day, so hopefully it’ll be “In Review” and then “Pending Developer Release” before the end of the day. Fingers crossed.
Aside: Arc Mini finally went live this morning! Though that won’t help with the problem you’re currently having. But for people who get frequent data gaps, it’ll offer some extra peace of mind, and hopefully solve that problem of frequent iOS terminations for them. It also has a couple of iOS Home Screen widgets - I use the “Current Item” widget to give me peace of mind that both apps are still alive, and also for little insights like how many minutes/hours I’ve been at the current place.