File versioning and restore
On paid plans, files uploaded through your service can be restored to an earlier version from the console - provided your storage bucket keeps versions. Versioning lives in your bucket, so it is yours to switch on.
1. Enable versioning on your bucket
For an S3 backend: open the bucket in the AWS console, go to Properties → Bucket Versioning and enable it. From that moment S3 keeps every version of newly uploaded files.
2. Restore from the service logs
Once versioning is on, any newly uploaded file can be restored from the service's Logs page in the DocEvent console - find the upload entry and use its restore action. Files uploaded before versioning was enabled have no earlier versions to restore.
Keep old versions from piling up
Every version counts toward your storage bill with your cloud provider. Add a lifecycle rule on the bucket to expire noncurrent versions after a period that suits you - see Amazon's object lifecycle management.