I'm not an English native speaker. Please sympathize for my poor English
Please read my following situation:
- In "My Document" folder, there are 3 files: A; B; C
- My friend (John) needs all three files, so I copy them to USB (or burn them to CD) and send that USB/CD to him
- After a long time, things have been change: File A has changed to A1, new files appeared: D, E; just B, C haven't changed. So, "my document" folder has 5 files: A1; B; C; D; E
- John wants me to send him just changed and new data: A1; D; E via another USB/CD.
Although I tried a lot of backup software, none of them could solve my problem. They always require A; B; C to exist on USB/CD, then they compare the source and the destination to see what have been changed, and backup/copy changed/new data to USB/CD.
Could anyone suggest a program that helps me solve my problem ?