What would I use the Advanced Option IncreasePathLengthLimit=1 for?
The MigrationWiz Advanced Option IncreasePathLengthLimit=1 addresses the issue of file path name character limitations.
OneDrive for Business now supports file path names with up to 400 characters. Read the Technet Article here.
Note that not every Office 365 tenant has been updated to support the increase in the number of file path name characters. However, when you include IncreasePathLengthLimit=1 in your project, you may prevent this error from occuring. Then, if it is available in your tenant, MigrationWiz will make use of the 400-character limit.