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Cannot create differential backup

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I have been through all the menus and options for configuring a backup and cannot find out how to configure a DIFFERENTIAL backup.  I have created Full backup already.   When I tried to create a new scheme, I ended up with another FULL backup scheme.  Now I have TWO FULL backup schemes and can't modify or delete the second one to get to a differential scheme. Documentation is very good at explaining the differences between Full, incremental, and differential, but does not tell you how to get there.

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Gary, welcome to these public User Forums.

The key to understanding all the backup schemes is that they all require a Full backup to be created after which further differential or incremental backups can be created based on the changes identified since that initial Full backup.  Neither incremental or differential backups can exist in isolation.

To create a differential backup simply select that option for Differential scheme along with the further option for how many such differential backups to create before starting over with a further new Full backup image.