I was starting to depend on Apple's Reminders on my watch as a way of doing GTD on-the-fly capture. E.g. while walking dog, hands full leash/bag, I could say "Hey Siri", and capture items for later review. Great for groceries; pretty good for work ideas. This worked for circa a month. I was beginning to think about making Reminders my main GTD list manager. ... However, with recent iOS/WatchOS updates, both Reminders and Calendar stopped synching between my Apple Watch and iPhone. No success fixing, neither reading support articles at Apple or oter websites, not Apple support phone, not Genius Bar. I have escalated from "Reset Synch State" to resetting entire watch, in combination with restoring iPhone from an iCloud backup. I have not yet tried reinstalling iPhone from scratch, but that is next escalation. In meantime, I am waiting for Godot, sorry, waiting for Apple to release a bug fix, etc. Calendar was the main reason I bought my Apple Watch - no that's just wasted money and time. -- As part of this debug I made a non-Apple backup of my iCloud Reminders - since one of the recommended steps was to delete existing Reminders lists ad To Do items. In case anyone else has to do this: The only way I found to Export my Reminders was in the Reminders app on MacOS. (I nolonger have a MacBook, borrowed my daughters.) Exports to a.ICS file, which is an easy to parse text format: VTODO: etc. There appears to be no way to Export Reminders on iCloud website on iPhone on iPad (older) I tried installing the iCloud app on my Windows PC, but install failed. MORAL: before you get dependent on a tool, verify that there is a convenient way to export to a non-proprietary format. -- Posting this because a) slight chance somebody here may know fix b) to warn others not to depend on Apple Watch Reminders in your GTD system and perhaps to ask people how they deal with potentially unreliable software. I would prefer to completely avoid unreliable software. But, Reminders was reliable in old WatchOS/iOS; it appears likely the "upgrade" introduced the bugs.