Time Machine Hangs (dopo "Preparazione" - 280 GB di 797 GB)

Grazie per aver letto questo. Ecco i dettagli:

1. Ho eseguito una cancellazione completa dell'HD e l'installazione pulita di Sierra.
2. Ho ripristinato solo i miei file di dati da un backup non di Time Machine.
3. Ho installato solo app da download recenti o CD / DVD originali.
4. La macchina è un iMac 27 "2011 con 16 Gb e 1 TB HD.
5. Parallels è installato e funziona bene per l'unica app che devo usare.
6. Il backup di TM non riesce a circa 280 GB ogni volta.
7. Ho preso l'unità TM originale (WD 1TB), l'ho riformattato, collegato al mio MBA e Time Machine funzionava perfettamente.
8. Ho preso un'altra unità WD da 1 TB, l'ho riformattata, collegata a iMac e avviato un nuovo backup TM. Si blocca proprio a quel punto da 280 GB.
9. Tramite Terminale ho eseguito il seguente comando:  log show --predicate 'subsystem == "com.apple.TimeMachine"' --info 10. Ho ricevuto le seguenti informazioni:

System mode = INFO STREAM_LIVE

My-iMac:~ MyUser$ log show --predicate 'subsystem == "com.apple.TimeMachine"' --info

Skipping debug messages, pass --debug to include.

Filtering the log data using "subsystem == "com.apple.TimeMachine""

Timestamp Thread Type Activity
PID 2016-10-15 19:37:08.967554-0400 0x360684 Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: No destinations resolvable

2016-10-15 19:37:39.705181-0400 0x36095e Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: No destinations resolvable

2016-10-15 21:35:35.680687-0400 0x3dd546 Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: No destinations resolvable

2016-10-15 21:36:05.899859-0400 0x3dd546 Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: No destinations resolvable

2016-10-16 08:24:09.935838-0400 0x4ac59c Error 0x0
34 UserEventAgent: (TimeMachine) [com.apple.TimeMachine.TMLogError] Failed to send message because the port couldn't be created.

2016-10-16 08:24:19.617684-0400 0x137a Error 0x0
320 UserEventAgent: (TimeMachine) [com.apple.TimeMachine.TMLogError] com.apple.TMHelperAgent.SetupOffer enabled

2016-10-16 08:24:19.979558-0400 0x4ad101 Error 0x0
34 UserEventAgent: (TimeMachine) [com.apple.TimeMachine.TMLogError] Failed to send message because the port couldn't be created.

2016-10-16 09:24:29.803739-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 27.09 GB of 724.83 GB, 480886 of 1033178 items

2016-10-16 10:24:33.049795-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 61.18 GB of 724.83 GB, 481194 of 1033178 items

2016-10-16 11:24:33.206805-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 73.51 GB of 724.83 GB, 491163 of 1033178 items

2016-10-16 12:24:38.632620-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 100.34 GB of 724.83 GB, 493153 of 1033178 items

2016-10-16 13:24:43.724930-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 145.64 GB of 724.83 GB, 493153 of 1033178 items

2016-10-16 14:24:45.201269-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 182.62 GB of 724.83 GB, 508541 of 1033178 items

2016-10-16 14:35:22.995746-0400 0x5e59df Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

2016-10-16 14:35:22.997422-0400 0x5e59df Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

2016-10-16 15:24:46.087902-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 235.82 GB of 724.83 GB, 524663 of 1033178 items

2016-10-16 16:24:46.990215-0400 0x4ae304 Info 0x0
14398 backupd: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Copied 270.76 GB of 724.83 GB, 639417 of 1033178 items

2016-10-16 16:55:29.860342-0400 0x5f3c8d Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

2016-10-16 16:55:30.031563-0400 0x5f3c8d Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

2016-10-16 17:55:29.176625-0400 0x62fca7 Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

2016-10-16 18:50:52.402975-0400 0x634fd2 Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

2016-10-16 21:13:49.493853-0400 0x642ad1 Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

2016-10-16 21:13:49.541508-0400 0x642ad1 Info 0x0
177 backupd-helper: (TimeMachine) [com.apple.TimeMachine.TMLogInfo] Not starting scheduled Time Machine backup: Backup already running

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Log - Default: 0, Info: 20, Debug:
0, Error: 3, Fault: 0 Activity - Create:
0, Transition: 0, Actions: 0

E ce l'abbiamo. Ancora appeso ... Ancora appeso ... La tua assistenza e i tuoi suggerimenti sono apprezzati.

EDIT: Se annullo e riavvio, eseguirò un backup di altri 2-3 GB e quindi si bloccherà.