But I'm happy with 2 methods I use today so I'll share that dismissing your specifications.
1. I use SYNCBACK. It's free and does what I need.
2. I use the simple right click, send to compressed ZIP file then copy that to the server or memory stick. Here's a picture -> http://s175.photobucket.com/albums/w146/rproffitt2000/?action=view¤t=SimpleBackup.jpg
My backup problems are solved and without any worry about proprietary backup formats!
I am searching for a (open source or freeware) backup software for Windows XP from which I can backup my data which in Linux EXT3 file system and shared in Windows XP using samba. I specially need to take *differential* backups but as ext3 does not support "archive" bit so backup software should have something like "backup last <nn> days modified file".
Thanks in advance,