Time Machine fails to complete its first full backup
I am running OS X Lion 10.7.5 on my 2011 Mac Mini. I recently had Melrose Mac upgrade its RAM to 16MB and its internal HD to a 2TB drive and they cloned my original data and restored it on the new drive.
I then partitioned the drive and installed Snow Leopard, Yosemite, and El Capitan on each of these partitions. All of which are Mac OS X Extended (Journaled). Each partition properly boots and runs.
I then took my LaCie 2 bay drive, with 1T drives in each bay, wiped it and set it up as "Fast" so that it will be seen as one 2T drive and selected this drive for Time Machine while in Lion. This drive is also Mac OS X Extended (Journaled).
About half way through the first backup (350 Gb), I get the following message from Time Machine; now it occurs more quickly:
And here it is recreated in Time Machine System Preference:
[click on image to enlarge]
I have followed the directions multiple times by using repair in Disk Utility on both the main LaCie drive and its partitin, but it does not report any errors. Then the Time Machine first backup will fail again about half way through.
I have reviewed Pondini's suggestions, but they do not cover this specific message and they do not seem to find the problem.
Any thoughts?
Mac mini, Mac OS X (10.7.5), 2011 also 10.6, 10.10 & 10.11