So, I did find more information while logging the backup and found that, for whatever reason, the backup just becomes "canceled" for no reasons that I can see. Incomplete backups are happening with some errors but the "error: 14 Bad address" appears to happen upon both successful and unsuccessful backups. Below is a log of a non-successful automatic backup that partly worked before it was randomly canceled. Granted, this is backing up over the network so it may be a different story for ErnieBernie, but this just seems hit and miss for no reason. I should also mention these backup issues only appeared after upgrading from High Sierra to Mojave. All users still on Sierra/High Sierra have no issues at all.
2018-12-04 10:48:48.288124-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Starting automatic backup
2018-12-04 10:48:48.508234-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Attempting to mount 'afp://my-user@nas.server.com/my-user'
2018-12-04 10:48:49.687983-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Mounted 'afp://my-user@nas.server.com/my-user' at '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B'
2018-12-04 10:49:20.185468-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Checking size of '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B/CO MPNAME.sparsebundle'
2018-12-04 10:49:45.605146-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Checking for runtime corruption on '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B/CO MPNAME.sparsebundle'
2018-12-04 10:49:48.084854-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Runtime corruption check passed for '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B/CO MPNAME.sparsebundle'
2018-12-04 10:49:48.547788-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Ejected disk2 from '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B/CO MPNAME.sparsebundle'
2018-12-04 10:49:57.747642-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B/CO MPNAME.sparsebundle' mounted at '/Volumes/Time Machine Backups'
2018-12-04 10:49:59.469918-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Backing up to /dev/disk2s2: /Volumes/Time Machine Backups/Backups.backupdb
2018-12-04 10:50:00.379652-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.SnapshotVolumeFSEventStoreUUID' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.379828-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.SnapshotVolumeLastFSEventID' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.379960-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.SnapshotVolumeUUID' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.380126-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.PreviousSnapshotVolumeUUID' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.380234-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.PreviousSnapshotVolumeName' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.380337-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.VolumeBytesUsed' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.380471-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.VolumeIsCaseSensitive' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.380595-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.fstypename' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.380700-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove attribute 'com.apple.backupd.VolumeIsEncrypted' from 'file:///', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.386655-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Starting age based thinning of Time Machine local snapshots on disk '/'
2018-12-04 10:50:00.399657-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to write unlock record UUIDs as extended attribute for disk '/', error: Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"
2018-12-04 10:50:00.567506-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Created Time Machine local snapshot with name 'com.apple.TimeMachine.2018-12-04-105000' on disk '/'
2018-12-04 10:50:00.575564-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Declared stable snapshot: com.apple.TimeMachine.2018-12-04-105000
2018-12-04 10:50:00.781092-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Mounted stable snapshot: com.apple.TimeMachine.2018-12-04-105000 at path: /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/COMPNAME/2018-12 -04-105000/Macintosh HD source: Macintosh HD
2018-12-04 10:50:01.385063-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Mounted reference snapshot: com.apple.TimeMachine.2018-12-04-093108 at path: /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/COMPNAME/2018-12 -04-093108/Macintosh HD source: Macintosh HD
2018-12-04 10:50:06.273920-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Will copy (114.2 MB) from Macintosh HD
2018-12-04 10:50:06.275076-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Found 930 files (114.2 MB) needing backup
2018-12-04 10:50:06.280511-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] 436 MB required (including padding), 2.04 TB available
2018-12-04 10:50:58.337700-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Copied 648 items (60.5 MB) from volume Macintosh HD. Linked 2333.
2018-12-04 10:51:00.414471-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Unmounted local snapshot: com.apple.TimeMachine.2018-12-04-105000 at path: /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/COMPNAME/2018-12 -04-105000/Macintosh HD source: Macintosh HD
2018-12-04 10:51:00.634659-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Unmounted local snapshot: com.apple.TimeMachine.2018-12-04-093108 at path: /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/COMPNAME/2018-12 -04-093108/Macintosh HD source: Macintosh HD
2018-12-04 10:51:00.836931-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Backup canceled.
2018-12-04 10:51:03.368742-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Unmounted '/Volumes/Time Machine Backups' (disk2s2)
2018-12-04 10:51:04.102426-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Ejected disk2 from '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B/CO MPNAME.sparsebundle'
2018-12-04 10:51:04.736524-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Unmounted '/Volumes/com.apple.TimeMachine.my-user-072763E2-0D08-4CFA-8E42-D1803E565F4B'
2018-12-04 10:51:04.736700-0700 localhost backupd[5439]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Failed to remove directory '(null)', error: 14 Bad address