Begin by thoroughly understanding the data structure in Aha, such as features, releases, or ideas that you want to migrate. Identify the specific data fields and types you need to transfer, as this will help in mapping data to Redis's data structures like strings, hashes, lists, sets, or sorted sets.

Use Aha's built-in export functionality to extract the data you need. Typically, Aha allows exporting data in CSV or Excel formats. Navigate to the relevant section in Aha, such as Features or Releases, and use the export option to download the data to your local machine.

Develop a script or use a spreadsheet tool to parse the exported CSV or Excel file. This step involves reading the file and extracting the data into a structure that can be easily iterated over. If writing a script, you might use a language such as Python with libraries like `csv` or `pandas` to handle the data efficiently.

Ensure you have a Redis server set up and running. You can run Redis locally by downloading it from the official Redis website and following the installation instructions. Alternatively, you can use a cloud-based Redis service if preferred. Ensure that you have the necessary access credentials and network permissions to connect to this server.

Based on the data types identified in step 1, decide how to store each piece of data in Redis. For example, you might use a Redis hash to store feature details with keys representing feature IDs. Define how each field from Aha will correspond to a Redis key or field within a hash.

Create a script in a language that supports Redis, such as Python with the `redis-py` library, to ingest data into Redis. The script should connect to Redis, iterate over the parsed data, and write each entry to the appropriate Redis data structure. Ensure that the script handles data types and possible exceptions, such as connection errors or data type mismatches.

After the data has been transferred, verify its integrity by checking a sample set of entries in Redis to ensure that they match the original data from Aha. This can be done manually using a Redis client like `redis-cli` or by extending your script to perform automated checks. Rectify any discrepancies to ensure the data has been accurately migrated.