So I haven't found the clear answer in Toucan's documentation (where is it at all? never mind, I understand not all software projects place as much emphasis on their documentation as their code as some) to this functionality. Here's what I'm trying to accomplish: I backup my stuff on two external drives, A and B. I store one of the drives off site, at a friend of family member living separately. Let's say every month we meet with the friend and family member and I refresh the content on the drive to mirror the content of the other drive that is with me on which I have changed some content.
Let me explain in more detail to make it clear, hopefully. So drive B is with the friend for a month. The content type I back up on both drives are mostly media if that's important, but I don't think so. Meanwhile I put some new data on drive A which is with me while removing other content, so there is some delta or difference starting to develop between the two drives during the month: Some content remains the same on both while drive A which I actively use during the month get some more data while also some of the data is being removed from it. But most of the data remains the same. So after a month when I meet the friend to sync the two drives ideally I just want to sync the delta, not wipe the whole drive B and write all content to it over from drive A. Just to apply the changes of the smaller delta: To remove the content that has been removed from drive A during the month and similarly add the content that has been added to drive A during the month. I hope what I want to say is more or less clear.
I'm not sure if I do my backup the right way (well, any kind of backup is better than no backup I guess) and if there is a popular free software on Windows or Linux capable of what want to accomplish. If I understand correctly, Toucan is written by PortableApps founder John, and probably isn't widely used by folks who don't use PortableApps anyway. Thanks for reading so far!
If you're at all comfortable with a command line, Robocopy sounds like exactly what you're looking for. It comes standard on all copies of windows since Vista. It's roughly comparable (for features) to rsync on linux.
Thanks for the tip. So Robocopy is made by Microsoft and rsync is not only for Linux, but cross-platform and they both have more or less the same functionality. But Toucan isn't built on any one of those for some reason. I don't know if it's possible to build it on Robocopy for legal reasons, but it's certainly not a problem with rsync. What I'm looking for right now is some easy to use portable software for Windows with a GUI with the functionality I described I need. If it's not Toucan, then I'm sure you here can recommend me an alternative.
Off. Why I don't see what I am replying to? I had to open this page in two tabs to see your post I'm replying to. It's (still) quite a strange looking forum.