Rsync is a very good package which allows use Linux users to synchronize files and folders on the same, or different machines. The concept behind Rsync is that is only updates files that have changed in date and file size. So, from a backup point of view, it can keep an accurate live backup when you run the command to synchronize the files.
Using Rsync On Same Computer
Using Rsync On Different Computers
Potential Problems:
Permissions. When you sync the files to the slave machine the folder should have adequate permissions. For example, if you login as pi@192.168.0.115 the files will transfer into the desired folder if the files or group is owned by pi. If you login as pi and attempt to move files into a folder owned by root, the sync will not happen.
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