Hello!

As far as I understand you are using Social Engine migration tool. This module is updated not so often and was not tested for last UNA versions.

By default migration tool should start from the last migrated item. For example: if you have 200 albums and there was some error during migration and script was stopped because of timeout error, then you can run migration again for albums and it should start from the last migrated album. Also to be sure that the script is stopped to work, you should check database namely tables into which you are moving data. If the number of records is not increasing then migration tool is stopped otherwise you should wait. For example: if you are moving profiles, then you can check bx_persons_data table, for photos you can check bx_albums_albums table and etc...