Hi ,
Sorry for the slow reply.

One of the best approaches to free up your storage space is to set correctly the retention policy for your data. The software will delete unnecessary data automatically.
Please refer to our blog section to get more details about the retention policy settings
https://www.msp360.com/resources/blog/backup-retention-policies/

Also, you can get more information about how to use AWS S3 storage as a backup destination at
https://www.msp360.com/resources/blog/amazon-s3-as-backup-storage/

Hope this helps.

If you have a backup plan that you are no longer using and you have no need for any of the data that has been backed up, you can delete the data from storage using the Storage tab. Then you can either delete the backup plan or remove the schedule so it does not run.

If, on the other hand, you are looking to free up space on existing backups, then do what Ivan posted and check your retention - you may be keep more data than needed. Feel free to reply with your retention needs and a screenshot of your retention settings if you would like us to review here.