![]() ![]() I am fairly certain but not 100% sure that this problem started after latest OS X update (10.15.5) on May 26. New LaCie drive (from Apple Store, installed April 30). Time Machine - Backup drive disappears Hello, Problem is: LaCie Backup Drive disappears - a couple hours after waking from Sleep mode, icon for LaCie Drive is gone, with message "LaCie Disc not Ejected Properly", consistently, and not showing in Finder. I just can't think of any other troubleshooting steps to take so any help would be very much appreciated. At this stage, if I had any hair, I'd be pulling it out in chunks. I'm back at square one – and I’ve lost six months worth of backups (although, thankfully, I did copy a selection of later backups). Excluding files copied over and ~/Library folder from backup in case corrupted files were copied over.Wiping startup drive, reinstalling 10.14 from rescue SSD, copying over backed up files (including very few ~/Library/Application Support files), reinstalling apps, re-erasing one Time Machine drive = first backup completes, subsequent backups stop with no error after varying lengths of time.Restarting from dedicated rescue SSD drive (Mojave 10.14) and running Disk Utility repair and Techtool Pro 11 on all drives.Erasing one of the Time Machine drives, running Disk Utility First Aid and selecting as Time Machine drive = first backup completes, subsequent backups stop with no error.Adding startup SSD drive to Spotlight Privacy pane and then removing so Spotlight indexes again.Making sure amount to be backed up is less than available space.Checking Console for errors/crashes = nothing obvious.Running Onyx maintenance (several times).Running Disk Utility repair (several times) on startup Samsung 860 EVO 500GB SSD drive (TRIM enabled) and both Time Machine drives.Despite extensive troubleshooting it's still happening. Both began 'Preparing backup…' as normal but then 'Stopping' after varying lengths of time with no error. I have Time Machine backing up to two drives – one internal and one external, both 3TB – which has been working perfectly until a few weeks ago. Mojave 10.14.6, Mac Pro 5,1, 32GB DDR3, Sapphire Pulse Radeon RX 580 8GB. ![]()
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