[NBLUG/talk] Synchronizing strategies

[Omar Eljumaily]

Does anybody know about file synchronization strategies, mainly for 
synching from a local file server to a cloud?  What I'm trying to 
accomplish is:

1. Any file that gets modified on the LAN server gets up-synched to the 
cloud say every hour.

2. Any file on the cloud that gets modified on the cloud gets 
down-synced to the LAN server.

3. All file overwrites in both places are archived before overwriting.

4. In case of a file in both locations being modified before or during 
when they are synched, a notification is sent to the owner of the file.

I have about 1 terabyte worth of files that need to be synched like 
this.  Some of the things I'm wondering are:

1. Is doing a modification directory search on 1 tb every hour going to 
place undo strain on the disk.

2. Are there any products, preferably open source, that do this already.

Anybody have any info/input would be greatly appreciated.

Thanks,

Omar