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Before I received your reply, I did some experimenting. In Windows, the Volume Shadow Copy Service is supposed to start when needed and then stop when done. On a hunch, I manually started it and then adjusted the Reflect schedule so I could see what would happen. Reflect ran to completion, doing a differential backup and then shutting down as it was supposed to. With no further VSS intervention, Reflect also ran as scheduled doing an incremental backup this morning. I turned the Windows Task Scheduler History on, which unfortunately, is disabled by default. If it had been on, I would perhaps have been able to get other clues as to why Reflect hadn't been running. Going forward, I'll have more debugging data if I have problems again. By the way, all 3 Macrium backup tasks were in the Windows Task Scheduler.
As I said before, when Reflect wasn't backing up on schedule, the Reflect icon never appeared in the Windows task bar tray, so a problem occurred before Reflect could start. And, doesn't Reflect have to run in order to update the Last Result column? Anyway, both the differential & incremental backup Last Result values have been overwritten now with the last two successes.
After I "kicked-started" the VSS service, Reflect started working. Hopefully, it'll keep on working. Any ideas as to why it suddenly started failing after 2 years of reliable backups and then started working again, but only after I manually started the VSS service?
Thanks for your opinion about this mystery.