I am looking for a software that can handle delta type backups (copying only new changes to a file, i.e. if a file changes from 500MB to 502MB, it will copy only the new 2 MB).
I am on a windows machine and copying to a windows machine. I have found a utility for Linux called rsync, but have had great difficulty in using the windows version of that along with ssh. I have tried a utility called unison as well which I have had difficulty setting up with ssh as well.
Is anyone aware of any other software backup utilities that can handle this type of backup?
I have my home computer mapped as a drive to my office computer via Hamachi VPN as well, so even if the software can do it as a local transfer with delta copying, that would be fine.
I've used both Unison and rsync with Windows. Both work but they do have their drawbacks.
Unison looked almost perfect for me, but it can't handle non-ASCII filenames. So my Japanese and Chinese named files cause Unison to crash. (It works great in areas where I have only ASCII filenames to sync.) I do run Unison via batch files on a number of directories and it's great...so far.
rsync does take a bit more effort and it's not a multi-directional sync solution like Unison. The key to installing rsync is to get Cygwin up and running. Cygwin has SSH variants in it that you can install. There are a ton of sites that give you installation tips and howto manuals. I use rsync for a lot of my remote sites, and it does a great job with websites.