Sorry if this is a basic question, but I am not that technical. We are about to refresh the Sandbox and I created a bundle to backup some work we need to reinstall after the refresh is completed. Now that I have the bundle under the "Saved Bundles", • What do I do next? • How do back this up and reinstall it after the refresh? I appreciate any help you provide. Thank you in advance.

@mescalante Install the bundle in your production account, or other SB accounts before you refresh the SB, otherwise you will lose everything, including the bundle you just created.

there used be an option to save your bundles in repository which was deprecated after SDF. As @Mika Hakkinen said install the bundle to prod or other SB then bring it back to refreshed SB. During the refresh your prod data will replace the SB data and that means your saved bundles will be nuked in the process, and no way to recover. This is way to back it up.