Your backups remain in the cloud storage until you delete them or until the subscription expires.
Recovering data from the cloud storage is possible for 30 days following the subscription expiration date.
For effective use of the storage space, you have the option to set up the "Delete backups older than" retention rule.
You might want to use the following backup strategy for a file server.
Back up the critical files twice a day on a schedule. Set the retention rule "Delete backups older than" 7 days. This means that after every backup the software will check for backups older than 7 days and delete them automatically.
Run backup of the server's system volume manually as required. For example, after the operating system updates. Manually delete the backups that you do not need.