Sometime, you modify a small file and you don’t need a full backup. It is recommended to make a full back-up every week and make everyday an incremental back-up.
You can use tar to make incremental back-up. In the next example we will backup all files from /home/adrian that are modified in the last 2 days:
tar -cf backup.tar /home/adrian –newer-mtime ‘2 days ago’
That’s it!