Disk Utility, APFS, System Data bloat, Time Machine failures, and the rest. Most of these are recoverable without erasing the disk — start with the article that matches your exact error string.
Fix "System Data" storage issue where hidden logs and caches consume hundreds of gigabytes of disk space.
StorageReclaim 50GB+ of "Other Users" space caused by accountssd log bloat on macOS Tahoe.
StorageForce delete stubborn "Relocated Items" folders on Tahoe that return after being trashed.
StorageFix external volumes mounting as read-only in Sequoia due to filesystem check locks.
StorageStop external drives from disconnecting every time your Mac enters sleep mode.
StorageReclaim 20GB+ of space by safely purging massive system and diagnostic log files.
StorageWhat to do when Disk Utility fails to format a USB drive or partition a volume.
StorageReclaim 10GB+ of space by safely removing legacy "Relocated Items" after the Tahoe upgrade.
StorageFix external USB-C and Thunderbolt drives not appearing on macOS Sequoia's desktop.
BackupFix generic errors and snapshot hangs on macOS Tahoe with these terminal commands.
StoragePurge massive system logs and reclaim storage used by hidden diagnostic files.
StorageStop external drives from disconnecting every time your Mac goes to sleep.
StorageWhat to do when Disk Utility says "Can't repair this disk" and First Aid fails.