Time Machine always does full backup

Hello,

Time Machine always performs a full backup.

I even tried reinstalling Mac OS X from the recovery partition, but the problem persists.

Here's the logs:

Apr 28 00:01:41 iMac com.apple.backupd[2075]: Starting manual backup

Apr 28 00:01:41 iMac com.apple.backupd[2075]: Backing up to /dev/disk0s2: /Volumes/Archivio/Backups.backupdb

Apr 28 00:01:42 iMac com.apple.backupd[2075]: Forcing deep traversal on source: "HD" (device: /dev/disk1s2 mount: '/' fsUUID: 1538692E-2AEE-3458-8888-6EC3065EE2F1 eventDBUUID: E46EE01F-4056-452E-AA80-EBD3DD056084)

Apr 28 00:01:45 iMac com.apple.backupd[2075]: Total content size: 136.97 GB excluded items size: 9.4 GB for volume HD

Apr 28 00:01:45 iMac com.apple.backupd[2075]: Found 2389490 files (127.57 GB) needing backup

Apr 28 00:01:45 iMac com.apple.backupd[2075]: 149.04 GB required (including padding), 875.49 GB available

Apr 28 00:01:45 iMac com.apple.backupd[2075]: Waiting for index to be ready (100)

Apr 28 00:19:36 iMac kernel[0]: process backupd[2075] thread 354793 caught burning CPU! It used more than 50% CPU (Actual recent usage: 54%) over 180 seconds. thread lifetime cpu usage 264.058027 seconds, (151.269108 user, 112.788919 system) ledger info: balance: 90002892869 credit: 261954647441 debit: 171951754572 limit: 90000000000 (50%) period: 180000000000 time since last refill (ns): 164769182301

Apr 28 00:19:42 iMac spindump[508]: Saved cpu_resource.diag report for backupd version ??? (???) to /Library/Logs/DiagnosticReports/backupd_2016-04-28-001942_iMac.cpu_resource.dia g

Apr 28 00:59:54 iMac.lan backupd[2075]: nil error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.bird was invalidated." UserInfo={NSDebugDescription=The connection to service named com.apple.bird was invalidated.}

Apr 28 01:01:37 iMac com.apple.backupd-helper[2077]: Not starting scheduled Time Machine backup: Backup already running

Apr 28 01:01:42 iMac com.apple.backupd[2075]: Copied 109.77 GB of 127.57 GB, 2175869 of 2389490 items

Apr 28 01:07:34 iMac com.apple.backupd[2075]: Copied 2321425 items (118.42 GB) from volume HD. Linked 0.

Apr 28 01:07:35 iMac com.apple.backupd[2075]: Created new backup: 2016-04-28-010735

Apr 28 01:07:36 iMac com.apple.backupd[2075]: Copying OS X Recovery set

Apr 28 01:07:51 iMac com.apple.backupd[2075]: Starting post-backup thinning

Apr 28 01:07:51 iMac com.apple.backupd[2075]: No post-backup thinning needed: no expired backups exist

Apr 28 01:07:51 iMac com.apple.backupd[2075]: Backup completed successfully.

Apr 28 02:02:07 iMac com.apple.backupd[2645]: Starting automatic backup

Apr 28 02:02:07 iMac com.apple.backupd[2645]: Backing up to /dev/disk0s2: /Volumes/Archivio/Backups.backupdb

Apr 28 02:02:09 iMac com.apple.backupd[2645]: Forcing deep traversal on source: "HD" (device: /dev/disk1s2 mount: '/' fsUUID: 1538692E-2AEE-3458-8888-6EC3065EE2F1 eventDBUUID: E46EE01F-4056-452E-AA80-EBD3DD056084)

Apr 28 02:02:09 iMac com.apple.backupd[2645]: Deep event scan at path:/ reason:must scan subdirs|require scan|

Apr 28 02:02:09 iMac com.apple.backupd[2645]: Running event scan

Apr 28 02:02:09 iMac com.apple.backupd[2645]: Finished scan

Apr 28 02:02:09 iMac com.apple.backupd[2645]: Saved event cache at /Volumes/Archivio/Backups.backupdb/iMac/2016-04-28-020209.inProgress/03FD950A-1 F83-4315-B404-79C5EA60B1C0/.1538692E-2AEE-3458-8888-6EC3065EE2F1.eventdb

Apr 28 02:02:09 iMac com.apple.backupd[2645]: Not using file event preflight for HD

Apr 28 02:07:31 iMac.lan backupd[2645]: nil error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.bird was invalidated." UserInfo={NSDebugDescription=The connection to service named com.apple.bird was invalidated.}

Apr 28 02:07:43 iMac com.apple.backupd[2645]: Will copy (128.78 GB) from HD

Apr 28 02:07:43 iMac com.apple.backupd[2645]: Found 2319156 files (128.78 GB) needing backup

Apr 28 02:07:43 iMac com.apple.backupd[2645]: 162.04 GB required (including padding), 751.13 GB available

Apr 28 03:02:12 iMac com.apple.backupd[2645]: Copied 5.29 GB of 128.78 GB, 7207 of 2319156 items

Apr 28 04:02:13 iMac com.apple.backupd[2645]: Copied 29.14 GB of 128.78 GB, 801888 of 2319156 items

Apr 28 04:02:46 iMac kernel[0]: process backupd[2645] thread 400712 caught burning CPU! It used more than 50% CPU (Actual recent usage: 50%) over 180 seconds. thread lifetime cpu usage 312.982317 seconds, (170.161237 user, 142.821080 system) ledger info: balance: 90000677450 credit: 311062423130 debit: 221061745680 limit: 90000000000 (50%) period: 180000000000 time since last refill (ns): 177216305691

Apr 28 04:02:50 iMac spindump[508]: Saved cpu_resource.diag report for backupd version ??? (???) to /Library/Logs/DiagnosticReports/backupd_2016-04-28-040250_iMac.cpu_resource.dia g

Apr 28 04:41:45 iMac.lan backupd[2645]: nil error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.bird was invalidated." UserInfo={NSDebugDescription=The connection to service named com.apple.bird was invalidated.}

Apr 28 04:50:37 iMac com.apple.backupd[2645]: Copied 2319723 items (118.33 GB) from volume HD. Linked 0.

Apr 28 04:50:37 iMac com.apple.backupd[2645]: Created new backup: 2016-04-28-045037

Apr 28 04:50:38 iMac com.apple.backupd[2645]: Starting post-backup thinning

Apr 28 04:50:38 iMac com.apple.backupd[2645]: No post-backup thinning needed: no expired backups exist

Apr 28 04:50:38 iMac com.apple.backupd[2645]: Backup completed successfully.

Apr 28 05:51:08 iMac com.apple.backupd[4661]: Starting automatic backup

Apr 28 05:51:08 iMac com.apple.backupd[4661]: Backing up to /dev/disk0s2: /Volumes/Archivio/Backups.backupdb

Apr 28 05:51:09 iMac com.apple.backupd[4661]: Forcing deep traversal on source: "HD" (device: /dev/disk1s2 mount: '/' fsUUID: 1538692E-2AEE-3458-8888-6EC3065EE2F1 eventDBUUID: E46EE01F-4056-452E-AA80-EBD3DD056084)

Apr 28 05:51:09 iMac com.apple.backupd[4661]: Deep event scan at path:/ reason:must scan subdirs|require scan|

Apr 28 05:51:09 iMac com.apple.backupd[4661]: Running event scan

Apr 28 05:51:09 iMac com.apple.backupd[4661]: Finished scan

Apr 28 05:51:09 iMac com.apple.backupd[4661]: Saved event cache at /Volumes/Archivio/Backups.backupdb/iMac/2016-04-28-055109.inProgress/268875A2-0 0DC-46ED-8A3B-36E28F4A6C74/.1538692E-2AEE-3458-8888-6EC3065EE2F1.eventdb

Apr 28 05:51:09 iMac com.apple.backupd[4661]: Not using file event preflight for HD

Apr 28 05:55:26 iMac.lan backupd[4661]: nil error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.bird was invalidated." UserInfo={NSDebugDescription=The connection to service named com.apple.bird was invalidated.}

Apr 28 05:55:37 iMac com.apple.backupd[4661]: Will copy (128.77 GB) from HD

Apr 28 05:55:37 iMac com.apple.backupd[4661]: Found 2319936 files (128.77 GB) needing backup

Apr 28 05:55:38 iMac com.apple.backupd[4661]: 165.05 GB required (including padding), 625.52 GB available

Apr 28 06:13:24 iMac kernel[0]: process backupd[4661] thread 480660 caught burning CPU! It used more than 50% CPU (Actual recent usage: 54%) over 180 seconds. thread lifetime cpu usage 353.199622 seconds, (194.969995 user, 158.229627 system) ledger info: balance: 90000590481 credit: 350311678346 debit: 260311087865 limit: 90000000000 (50%) period: 180000000000 time since last refill (ns): 163799979806

Apr 28 06:13:28 iMac spindump[508]: Saved cpu_resource.diag report for backupd version ??? (???) to /Library/Logs/DiagnosticReports/backupd_2016-04-28-061328_iMac.cpu_resource.dia g

Apr 28 06:51:10 iMac com.apple.backupd[4661]: Copied 102.69 GB of 128.77 GB, 2146758 of 2319936 items

Apr 28 06:53:08 iMac.lan backupd[4661]: nil error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.bird was invalidated." UserInfo={NSDebugDescription=The connection to service named com.apple.bird was invalidated.}

Apr 28 07:01:48 iMac com.apple.backupd[4661]: Copied 2319941 items (118.33 GB) from volume HD. Linked 0.

Apr 28 07:01:49 iMac com.apple.backupd[4661]: Created new backup: 2016-04-28-070148

Apr 28 07:01:50 iMac com.apple.backupd[4661]: Starting post-backup thinning

Apr 28 07:01:50 iMac com.apple.backupd[4661]: No post-backup thinning needed: no expired backups exist

Apr 28 07:01:50 iMac com.apple.backupd[4661]: Backup completed successfully.

Apr 28 08:02:20 iMac com.apple.backupd[5112]: Starting automatic backup

Apr 28 08:02:21 iMac com.apple.backupd[5112]: Backing up to /dev/disk0s2: /Volumes/Archivio/Backups.backupdb

Apr 28 08:02:22 iMac com.apple.backupd[5112]: Forcing deep traversal on source: "HD" (device: /dev/disk1s2 mount: '/' fsUUID: 1538692E-2AEE-3458-8888-6EC3065EE2F1 eventDBUUID: E46EE01F-4056-452E-AA80-EBD3DD056084)

Apr 28 08:02:22 iMac com.apple.backupd[5112]: Deep event scan at path:/ reason:must scan subdirs|require scan|

Apr 28 08:02:22 iMac com.apple.backupd[5112]: Running event scan

Apr 28 08:02:22 iMac com.apple.backupd[5112]: Finished scan

Apr 28 08:02:22 iMac com.apple.backupd[5112]: Saved event cache at /Volumes/Archivio/Backups.backupdb/iMac/2016-04-28-080222.inProgress/2FCA228A-D 4F1-4EDE-9192-72CF1B3193BC/.1538692E-2AEE-3458-8888-6EC3065EE2F1.eventdb

Apr 28 08:02:22 iMac com.apple.backupd[5112]: Not using file event preflight for HD

Apr 28 08:06:17 iMac.lan backupd[5112]: nil error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.bird was invalidated." UserInfo={NSDebugDescription=The connection to service named com.apple.bird was invalidated.}

Apr 28 08:06:28 iMac com.apple.backupd[5112]: Will copy (128.78 GB) from HD

Apr 28 08:06:28 iMac com.apple.backupd[5112]: Found 2319946 files (128.78 GB) needing backup

Apr 28 08:06:29 iMac com.apple.backupd[5112]: 167.95 GB required (including padding), 503.35 GB available

Apr 28 08:21:09 iMac kernel[0]: process backupd[5112] thread 514599 caught burning CPU! It used more than 50% CPU (Actual recent usage: 57%) over 180 seconds. thread lifetime cpu usage 315.214919 seconds, (174.659268 user, 140.555651 system) ledger info: balance: 90002804135 credit: 312721050787 debit: 222718246652 limit: 90000000000 (50%) period: 180000000000 time since last refill (ns): 156851655644

Apr 28 08:21:12 iMac spindump[508]: Saved cpu_resource.diag report for backupd version ??? (???) to /Library/Logs/DiagnosticReports/backupd_2016-04-28-082112_iMac.cpu_resource.dia g

Apr 28 09:02:22 iMac com.apple.backupd[5112]: Copied 98.44 GB of 128.78 GB, 2128720 of 2319946 items

Apr 28 09:06:40 iMac.lan backupd[5112]: nil error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.bird was invalidated." UserInfo={NSDebugDescription=The connection to service named com.apple.bird was invalidated.}

Apr 28 09:15:48 iMac com.apple.backupd[5112]: Copied 2319940 items (118.33 GB) from volume HD. Linked 0.

Apr 28 09:15:50 iMac com.apple.backupd[5112]: Created new backup: 2016-04-28-091549

Apr 28 09:15:51 iMac com.apple.backupd[5112]: Starting post-backup thinning

Apr 28 09:15:51 iMac com.apple.backupd[5112]: No post-backup thinning needed: no expired backups exist

Apr 28 09:15:51 iMac com.apple.backupd[5112]: Backup completed successfully.