windows - Does backup software lock you in?

I just bought a new Iomega external drive, and I'm trying to figure out which software to use to manage backups. I am not looking for software recommendations. These are already available in other SU questions.

I am simply asking: does product XYZ lock you in, yes or no?

Examples of the answers I am looking for:

• Norton 360: yes. You cannot access Norton 360 backups with other software.


• xcopy: no. xcopy does not modify the file contents in any way.

One product per answer please.

EDIT: Some additional info:

• I am using Windows XP Professional (SP3).


• I am particularly interested in: Iomega QuikProtect (included with the HDD), EMC Retrospect (also included), SyncBack (seems highly recommended), Cobian (same). But answers about any Windows product are welcome.