F-backup on partially backed up data

[lumberfern]

Hi folks,
I am a new user of F-backup. In the past, I used to use Syncback free version to backup my data on external HDD.
I would like to use F-backup in future. I wonder if there is any setting that I need to keep an eye on which will help F-backup recognize already backed up files and only update the changed files (the syncback setting is, laptop being a source, update files on external HDD and delete those are not present on the laptop).
I am sorry, I am not too sure of technical term for this kind of backup, so putting it in layman's term.
Many thanks,

[Adrian (Softland)]

Hi,
If you use the Mirror backup type from FBackup, only new and modified files will be backed up.