How to back up a specific folder on Windows 7?

Question

Backup

There is a folder with documents. It syncs with Google Drive. Recently there was a small failure and some of the files were deleted. I had to restore from the trash. In this regard, it became necessary to provide an additional method for backup.
It is necessary that a specific folder be automatically copied to some place (most likely an external HDD) whenever any changes are made to it (to files in folders) (i.e., like in Google Drive).
It is required that all this happens in the background and does not disturb the user in any way.
Plus, it would be great to have the ability to save deleted files.
Those. if a file is deleted in the main directory (from where the backup is made), then it should not be deleted in the backup folder, but should be somehow "marked".

Answer 1

You can use FreeFileSync by setting up synchronization after a certain period of time, and for deleted files you can set up a separate folder where they will be stored during the next synchronization

Answer 2

Allway Sync