How to backup the backup?

[ts678]

Welcome to the forum @emederios

@emedeiros

I guess doing incremental copy tasks with rsync or whatever tool would make it more viable, but then we would need to restore those copied Duplicati files before using Duplicati to restore its backup.

And let’s imagine we want to do this backup of the backup run on a daily basis, just like the rest of the backups: if we use whatever tool to create a complete copy of each daily backup, it’s going to be a huge waste of space and time

I’m not sure I follow these two thoughts. The latter complete copy would be made incrementally as first paragraph suggests. Duplicati makes new files, doesn’t overwrite, but will delete when it runs compact.

Keeping the original copy of the rsync (or rclone or whatever one-way file-based sync) would allow the restore to use that copy without restoring a backup-of-backup, unless ransomware etc. destroyed it…

Propagating issues, whether from Duplicati bug or ransomware, is a concern with cascaded backups. Best practice for backup safety calls for multiple backups made in very different ways. Best protection against ransomware relies on backend security, as malware on host may have full control of machine.

SFTP/SSH backups to a Linux server with added security was one approach to protection against that.

Financial services industry regulations may require records in non-erasable and non-rewritable stores which some cloud providers (Amazon S3 for example) can provide. WORM also stops ransomware…