The Confluence Backup Manager plugin makes it simple to take nightly backups of Confluence as well as list, download and automate the deletion of older backups.
Confluence Backup Manager features & benefits
Delete backups manually
Automate backup pruning
Keep Some Safe – Specify how many backups should remain safe from deletion.
Delete Old Backups – Specify how many days backups should be kept for.
Disk Space – Set and maintain quotas on backup disk space.
Scheduled Deletions – Tell the plugin what should be deleted, and how often to do it.