Version 3.0.3 was released on 12/1/2021. It addresesses this issue.
Migration fails on windows with larger files
At this point we have only seen this error on Windows with Otto 3.0.2 The error is related to the 19.4.1 version of the Claris Data Migration Tool. It doesn't happen on all migrations. Only files that are bigger than 2 or 3 gb seem to be affected by this issue.
The Otto logs and results will say that the migration failed. When you look at the results of the migration you will see lines like the ones below in the Migration Results.
2021-11-28 00:36:35.137 -0500 [Main_14b0] Multithreaded backup is Disabled
2021-11-28 00:36:35.293 -0500 [Main_14b0] Use default group for backup is Enabled