I am looking for a way to automatically backup and archive certain files on my hard drive to a NAS in Windows 10 pro 64bit. By that I mean that I can add files to the directory on my disk and it will be automatically stored on the NAS when it is available (it's an Ubuntu PC connected as a network drive using samba that isn't always available when the PC is on). I don't simply want to sync the directory, I want the NAS to serve as an archive, so that when I delete files on the source they remain indefinitly on the NAS. I also have directories which I want to simply keep in sync, for that I was thinking I could just use Sync Center.
As an example: I have a folder of photos locally. I'll never delete anything on it, but in case I do or my disk breaks, I want to have a full backup of everything that has ever touched that folder. On the other hand I may have a Downloads directory which I want backed up, but if I delete a file it should also be deleted on the network storage when the next sync occurs.
Can someone suggest preferably Windows functionality to do this, or open source software that can help me with that? I'd rather not set up a complicated custom solution using scripts etc.