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Colonel Panik

macrumors regular
Original poster
Feb 23, 2004
206
14
Dublin, Ireland
Twice today the electricity suddenly cut out. Very rare here, last time this happened was the 1980s, and no bad weather to blame.

I had a 10MB password-protected (hence encrypted) disk image (DMG) open, with some text files inside.

M1 mac mini has an SSD.
Electricity cut for a large area of the city.

On restoration of the electricity, the DMG that was open couldn't be re-opened: "The disk image couldn't be opened. Failed to mount filesystems."
Needless to say, this is data loss.
DMG was stored in the iCloud Drive folder.

The electricity went off again a couple of hours later, and an alternate, back-up DMG I had opened suffered the same issue.

If I had larger DMGs open (I have some which are GBs in size, the data loss would be catastrophic). Of course, I'm not going to test this on my machines.
Is the problem iCloud? No changes were made to the DMG, it was simply open and files inside opened on BBEdit as a reference.

Thoughts?
 
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