Since upgrading to Mavericks I have been unable to complete a time machine backup. I have a clean install, backing up to a directly connected freshly formatted USB drive with twice the capacity needed. The backup with apparently complete, but then go into a second 'pass', where instead of correctly estimating the amount to back up it will continuously revise the amounts, e.g. 20mb of 80mb, then 40mb of 120mg, etc, continuously climbing, while saying it has seconds remaining. Here are my recent logs (Achilles is an SSD, Tortoise is a spinning disk). Any help would be gratefully appreciated! Starting automatic backup Backing up to /dev/disk5: /Volumes/2tb portables/Backups.backupdb Forcing deep traversal on source: "Achiles" (device: /dev/disk0s2 mount: '/' fsUUID: 45F81C62-0E42-37FE-A796-CCA9DCF36641 eventDBUUID: 694C0ED1-1C0C-4B31-8487-CEEBD3D513D0) Deep event scan at path:/ reason:must scan subdirs|require scan| Finished scan Not using file event preflight for Achiles Will copy (Zero KB) from Tortoise Found 944042 files (64.43 GB) needing backup 83.68 GB required (including padding), 998.32 GB available Error -35 while resolving alias to backup target Error -35 while resolving alias to backup target Error -35 while resolving alias to backup target Copied 49.65 GB of 64.43 GB, 923695 of 944042 items Copied 944042 items (54.79 GB) from volume Achiles. Linked 0. Copied 1 items (Zero KB) from volume Tortoise. Linked 19. Not using file event preflight for Achiles Will copy (13.2 MB) from Tortoise Found 944048 files (64.45 GB) needing backup 84.67 GB required (including padding), 939.68 GB available Copied 12.67 GB of 64.45 GB, 207426 of 944048 items Update - after several hours just completed a backup. At the hourly re-backup, it's started again, gradually increasing what it wants to backup, to what is looking like it will be the whole contents again... So looking again at the new logs, it looks like the issue is to do with the ssd: Deep event scan at path:/ reason:must scan subdirs|require scan| Finished scan Not using file event preflight for Achiles Will copy (Zero KB) from Tortoise Found 944052 files (65.22 GB) needing backup 86.27 GB required (including padding), 936.22 GB available It looks like TM is copying the whole of the OS drive every time, but working correctly for the spinning drive. Any ideas? Thanks!