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Backing up only new files

Hello scripters !

I am very proud of my little simple backup script. ;-))
I use it everyday, at work without trouble, but... now , after months of use, I would like to improve it.

Could it be possible to backup ONLY what has been modified or created, not replacing the entire volume ?
How does AS compare files, and decide they are the same (not just the same name) ?

I am wondering how I could do it.
I was thinking of comparing the 2 folders items lists.
It could go like this:

---
set Folder1Contents to list folder BUSource without invisibles
set Folder2Contents to list folder BUDestination without invisibles
repeat with x in Folder1Contents
---

Could it be the right way to seek ?

Thanks in advance or the advices.

Apologies for basic question and poor english.

Bernard
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