10.0.3 update killed Time Machine backups

Since the 10.0.3 update around 6am this morning, every Time Machine on Big Sur 11.2.1 backup fails.  The last Time Machine backup that worked was around 5:30am.

Once the backup failed because target disk could not be found, the rest of the failures had no error listed.  I've rebooted the NAS and rebooted the MacBook Pro multiple times.  Nothing works.

Any suggestions?



spelling error fixed
[edited by: Brian Bresnan at 7:29 PM (GMT -8) on 11 Feb 2021]

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  • thank you for performing these tests. at this time I have a few ideas what could cause the failure. form experience, SMB volume access can be disturbed by open file handles (for example our scanning process) and then abort current operation with "file in use" - I am thinking of a better detection and exclusion of time machine volumes shared via SMB. Could you also make sure that the "remote files" option is turned off (while real time scanning itself is enabled in your Threat Protection policy.

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  • Here's the Time Machine log:

    2021-02-11 14:35:09.521588-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Starting automatic backup

    2021-02-11 14:35:09.534255-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Network destination already mounted at: /Volumes/.timemachine/NAS2._smb._tcp.local./2BBE5A07-59F0-4286-B0B5-5AD4790365CD/TimeMachine2020

    2021-02-11 14:35:09.552503-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Initial network volume parameters for 'TimeMachine2020' {disablePrimaryReconnect: 0, disableSecondaryReconnect: 0, reconnectTimeOut: 30, QoS: 0x20, attributes: 0x1C}

    2021-02-11 14:35:09.565302-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Configured network volume parameters for 'TimeMachine2020' {disablePrimaryReconnect: 0, disableSecondaryReconnect: 0, reconnectTimeOut: 30, QoS: 0x20, attributes: 0x1C}

    2021-02-11 14:35:11.029180-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Found matching sparsebundle 'MacBookPro.sparsebundle' with host UUID '98995D84-43D4-5EC2-82E8-AA8AE425DF18' and MAC address '(null)'

    2021-02-11 14:35:11.301935-0500 0x4b7ee    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Mountpoint '/Volumes/.timemachine/NAS2._smb._tcp.local./2BBE5A07-59F0-4286-B0B5-5AD4790365CD/TimeMachine2020' is still valid

    2021-02-11 14:35:11.302709-0500 0x4b7ee    Error       0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Invalid mountpoint '/Volumes/Backups of MacBookPro' - failed to open '/Volumes/Backups of MacBookPro/.iotest', error: 5 Input/output error

    2021-02-11 14:35:11.302828-0500 0x4b7f2    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Stopping backup to allow volume '/Volumes/Backups of MacBookPro' to be unmounted.

    2021-02-11 14:35:11.302859-0500 0x4b7f2    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Backup cancel was requested.

    2021-02-11 14:35:21.308142-0500 0x4b7f2    Error       0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] backupd exiting - cancelation timed out

    2021-02-11 14:35:21.311120-0500 0x445aa    Error       0x0                  223    0    backupd-helper: (TimeMachine) [com.apple.TimeMachine:General] XPC error for connection com.apple.backupd.xpc: Connection interrupted

    2021-02-11 14:35:21.311230-0500 0x445aa    Error       0x0                  223    0    backupd-helper: (TimeMachine) [com.apple.TimeMachine:General] Not starting scheduled Time Machine backup: Failed to send message to backupd

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  • Here's the Time Machine log:

    2021-02-11 14:35:09.521588-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Starting automatic backup

    2021-02-11 14:35:09.534255-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Network destination already mounted at: /Volumes/.timemachine/NAS2._smb._tcp.local./2BBE5A07-59F0-4286-B0B5-5AD4790365CD/TimeMachine2020

    2021-02-11 14:35:09.552503-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Initial network volume parameters for 'TimeMachine2020' {disablePrimaryReconnect: 0, disableSecondaryReconnect: 0, reconnectTimeOut: 30, QoS: 0x20, attributes: 0x1C}

    2021-02-11 14:35:09.565302-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Configured network volume parameters for 'TimeMachine2020' {disablePrimaryReconnect: 0, disableSecondaryReconnect: 0, reconnectTimeOut: 30, QoS: 0x20, attributes: 0x1C}

    2021-02-11 14:35:11.029180-0500 0x4b7ed    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Found matching sparsebundle 'MacBookPro.sparsebundle' with host UUID '98995D84-43D4-5EC2-82E8-AA8AE425DF18' and MAC address '(null)'

    2021-02-11 14:35:11.301935-0500 0x4b7ee    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Mountpoint '/Volumes/.timemachine/NAS2._smb._tcp.local./2BBE5A07-59F0-4286-B0B5-5AD4790365CD/TimeMachine2020' is still valid

    2021-02-11 14:35:11.302709-0500 0x4b7ee    Error       0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Invalid mountpoint '/Volumes/Backups of MacBookPro' - failed to open '/Volumes/Backups of MacBookPro/.iotest', error: 5 Input/output error

    2021-02-11 14:35:11.302828-0500 0x4b7f2    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Stopping backup to allow volume '/Volumes/Backups of MacBookPro' to be unmounted.

    2021-02-11 14:35:11.302859-0500 0x4b7f2    Info        0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] Backup cancel was requested.

    2021-02-11 14:35:21.308142-0500 0x4b7f2    Error       0x0                  6573   0    backupd: (TimeMachine) [com.apple.TimeMachine:General] backupd exiting - cancelation timed out

    2021-02-11 14:35:21.311120-0500 0x445aa    Error       0x0                  223    0    backupd-helper: (TimeMachine) [com.apple.TimeMachine:General] XPC error for connection com.apple.backupd.xpc: Connection interrupted

    2021-02-11 14:35:21.311230-0500 0x445aa    Error       0x0                  223    0    backupd-helper: (TimeMachine) [com.apple.TimeMachine:General] Not starting scheduled Time Machine backup: Failed to send message to backupd

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