Is there any way to recover the lost macros? I don't have a recent enough backup. I had optimistically hoped that KM would keep a few backups in its icloud folder for exactly these situations but to no avail. Suggestions?
Hey there, that’s quite frustrating. A search of the forum will provide you quite a few topics that cover this. 
Sorry for the loss, and good luck with the recovery—Chris' post links to some very useful tips, a couple of which I have used in the past to recover from just this situation.
Going forward, you might want to try my MacroBackerUpper macro, which I wrote as a result of having to go through this recovery one too many times :).
MacroBackerUpper creates a Time-Machine-like set of backups of your macros, making it easy to recover any number of macros from any number of points in time.
-rob.
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Keyboard Maestro does keep a running local backup of your Macro Library. On the Mac that had the last good version I think I would temporarily disable syncing before trying this.
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Oh, brilliant. Let me try that. Thank you
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It worked!
I am thinking of adding a Hazel script to make daily backups of the sync file on iCloud as a double-backup. I would have lost days of work if it weren't for that awesome File→Revert Macros command
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Upvote for Hazel, I couldn‘t live without it these days.
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I personally put my KM Sync file in Dropbox, it has better file versioning than iCloud, while still syncing across machines.
I fear with so much cloud storage folks are getting blasé about rigorous backups.
PSA: Use Time Machine (or any other backup method you might prefer)
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