How is it determined a file has changed since the last backup, for incremrental or differential backups.
I have not been able to find a description of how it is determined that a file has been changed since the last backup when doing incremental or differential backups. This could be important for a user to know.
Does it just use the archive attribute of the file?
Does it compare size with most recent backed up file?
Does it compare modification or creation date with the most recent backed up file?
Does it compare content or checksum with the most recent backup up file?
For example, if another backup product had been used since the previous backup with Acronis, and Acronis only used the archive attribute, and the other product also used this attribute, then the incremental or differential backup would be incomplete.
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Can you make a change to a file without changing the sector pattern? Is this the only test that is made? I did see a note if the disk is defragged, then all files that were moved would be treated as having changed.
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If you change a file data or metadata (eg: content, logical or physical location on the disk, title, attributes, ...), there will be sector changes, and ATI will backup these changes.
If you move a file, this changes sectors. If you defragment a file, this changes sectors, etc.
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Frederick Sieber wrote:Can you make a change to a file without changing the sector pattern? ...
You may be able to do it with a disk editor since it may change the sector contents directly. Normal file operations that change (overwrite) a file write out the complete file including the changes and then delete the original file.
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