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<blockquote data-quote="MacInWin" data-source="post: 1813726" data-attributes="member: 396914">Mojave creates what are called snapshots for backup purposes. The snapshots are considered to be system files. I would suspect that your system is full of these snapshots. So, first thing is to look at the settings for Time Machine. Open System Preferences/Time machine and look to see if &quot;Back Up Automatically&quot; is checked. If it is, and if you do NOT have the backup drive attached all the time, then every hour a snapshot is taken. These snapshots are cleaned up when a backup is made and the snapshots are released. So, if your backup drive is not attached, attach it and let it back up (it will take quite a while if those 840GB are, in fact, snapshots). Or if that box is checked and you've NEVER done a backup, that can also cause snapshots to be created that will never go away until you DO make a backup.&nbsp; Frankly, I recommend backups for everyone, but it's up to you what you do.Here is a thread here from a while ago with some information on snapshots:&nbsp; <a href="https://www.mac-forums.com/showthread.php?346378-What-is-using-up-all-my-memory&amp;highlight=snapshots" target="_blank">https://www.mac-forums.com/showthread.php?346378-What-is-using-up-all-my-memory&amp;highlight=snapshots</a>Give that a look, read the entire thread before you do anything, there are good suggestions there. But read the entire thread to get a good understanding of what may be happening.So, if snapshots is the issue, get rid of them by the methods suggested&nbsp; in that thread, then see if that drive recovers.&nbsp; If it doesn't, come back and we'll try something else. My money is on snapshots.</blockquote>

[QUOTE="MacInWin, post: 1813726, member: 396914"] Mojave creates what are called snapshots for backup purposes. The snapshots are considered to be system files. I would suspect that your system is full of these snapshots. So, first thing is to look at the settings for Time Machine. Open System Preferences/Time machine and look to see if "Back Up Automatically" is checked. If it is, and if you do NOT have the backup drive attached all the time, then every hour a snapshot is taken. These snapshots are cleaned up when a backup is made and the snapshots are released. So, if your backup drive is not attached, attach it and let it back up (it will take quite a while if those 840GB are, in fact, snapshots). Or if that box is checked and you've NEVER done a backup, that can also cause snapshots to be created that will never go away until you DO make a backup. Frankly, I recommend backups for everyone, but it's up to you what you do. Here is a thread here from a while ago with some information on snapshots: [url]https://www.mac-forums.com/showthread.php?346378-What-is-using-up-all-my-memory&highlight=snapshots[/url] Give that a look, read the entire thread before you do anything, there are good suggestions there. But read the entire thread to get a good understanding of what may be happening. So, if snapshots is the issue, get rid of them by the methods suggested in that thread, then see if that drive recovers. If it doesn't, come back and we'll try something else. My money is on snapshots. [/QUOTE]

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