What is "Only copy new or modified files"?
When the backup program copies files, it compares the files in the source and destination folders and only copies the new or modified files from the source to the destination.
The advantage is saving backup time and enabling the backup of data more frequently, thus improving data integrity.
What is "Copy all files at every time"?
When the backup program copies files, it
copies all source files to the destination folder and forces the
overwriting of the same files in the destination folder.