Manual:The Dude v6/Change DB path
Applies to RouterOS: v6.34+
To change where the Dude servers stores it's stuff you need to use following command.
/dude set data-directory=(new_db_path)
Note: We do not suggest to using flashes/disks that are formatted with FAT32 file-system, better before use re-format it as EXT3. For more details on how to do that consult [this ] wiki article.