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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.
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.
rdiff-backup looks good for *nix, but this StoreGrid program looks great for Windows in performing incremental backups by keeping track of actual bit differences between older and newer files.