Time Machine works, but when disconnected keeps saying "Could not complete backup"

Running Snow Leopard 10.6.8 on a late '08 MBP: While connected to my work's external 1TB drive, TM operates as expected. Every day I disconnect and take it home. Without the TM drive available, every so often I get "TM could not complete the backup."
Suspecting a glitchy .plist, I moved com.apple.timemachine to my desktop and hit "Back Up Now." Evidently now the new plist doesn't recognize the >600GB of TM data logged, as, of course, it shows no previous backups (image attached). I feared that proceeding would mean it would begin an entirely NEW routine—rendering my existing TM useless. So I stopped, replaced the previous plist, and (whew) again TM shows my history.
So it's not a critical issue, but a regular annoyance: why does TM now think it has to tell me every time it didn't work? This started up maybe a week or two ago, and I don't recall any system modifications. I see nothing in the TM prefs that would trigger this.
Any ideas? Thanks.

+1
Same issue on Mountain Lion 10.8.5. Extremely annoying to get this dialog box over and over throughout the day.
Time Machine preferences shows "Next backup: When disk is connected". So why doesn't it simply wait until a disk is connected and only alert me then if there is a failure?
OP - did you ever solve this issue?
Thanks,
Lance

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Adobe Photoshop Version: 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00) x64
Operating System: Windows 7 64-bit
Version: 6.1 Service Pack 1
System architecture: Intel CPU Family:6, Model:10, Stepping:9 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2, HyperThreading
Physical processor count: 2
Logical processor count: 4
Processor speed: 2494 MHz
Built-in memory: 6019 MB
Free memory: 3360 MB
Memory available to Photoshop: 5227 MB
Memory used by Photoshop: 60 %
Image tile size: 128K
Image cache levels: 4
OpenGL Drawing: Enabled.
OpenGL Drawing Mode: Advanced
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
OpenGL Allow Old GPUs: Not Detected.
OpenCL Version: 1.2
OpenGL Version: 2.1
Video Rect Texture Size: 16384
OpenGL Memory: 2112 MB
Video Card Vendor: Intel
Video Card Renderer: Intel(R) HD Graphics 4000
Display: 1
Display Bounds: top=0, left=0, bottom=768, right=1366
Video Card Number: 1
Video Card: Intel(R) HD Graphics 4000
Driver Version: 10.18.10.3958
Driver Date: 20140930000000.000000-000
Video Card Driver: igdumdim64.dll,igd10iumd64.dll,igd10iumd64.dll,igdumdim32,igd10iumd32,igd10iumd32
Video Mode: 1366 x 768 x 4294967296 colors
Video Card Caption: Intel(R) HD Graphics 4000
Video Card Memory: 2112 MB

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Time Machine works, but when disconnected keeps saying "Could not complete backup"

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