Your account is also S3-compatible storage (on the plans that include it). Open S3 storage in the web app:

  1. Click New bucket. For immutable backups, switch on Object Lock (immutable backups), and leave Hold every new object by default off when the backup program sets its own retention (Veeam does).
  2. Click New access key, choose Read and write (backups) and tick Only some buckets to limit it to the bucket. The secret is shown once: copy it into the backup program.
  3. In the backup program, add S3-compatible object storage with the endpoint and region shown at the top of the page, path-style addressing and Signature Version 4.

Set up your software, lower on the same page, gives the exact steps for Veeam, Backup Exec, NetBackup, rclone, the AWS CLI and other tools, filled in with your endpoint and buckets. Run a backup and a restore before you rely on a new repository.

Objects under an Object Lock retention in compliance mode cannot be deleted or shortened by anyone before their date, and they count towards your storage until then.