Is there a program to track changes in files and folders on the server?

Question

Software and Internet Services

Situation: you need to track changes in files on the VPS, preferably through something convenient (if it looks like two columns, the old version is on the left, the new version is on the right and is shown with red / green highlights for changes, it would be ideal). The interval is a week. Ubuntu 16.4. Down\up-load files are sent via ftp.
There are options? How much do they load the server?
Options for synchronizing the server and the local folder are also being considered, I will be grateful for the answers.

Answer 1

you put all this on a file system with snapshots.
for example ZFS
and with the zfs diff command you can see the list of changes and get the changes themselves.

Answer 2

git
bash + inotify