How are changes determined?

Am I correct in thinking that changes, for an incremental or differential back, are determined by looking at the latest backups in the backup location being used for the current backup? That is, if I have two different backup locations, and do backups at different times, then the incremental or differential backups will be different, based on the prior backups it uses to find changes?

I ask because the documentation tends to say "changes since the last backup" - but I think it is really "changes since the last backup in the current backup location." A newer backup in a different location has no impact.

I know some software uses modification date, or the archive attribute, or other techniques to determined if a file should be backed up. I just want to make sure I understand how TI works.

Thanks
Dan

 

That is correct.

At the same time, my understanding is Acronis determines changes by changes in sectors on the hard drive - not changes to the files themselves. For example, if defragging moves a file around, Acronis will see it as a change and will backup it up again.