Because I have not dealt with exchange server before, about these OST files. Even if I can't backup the data embedded within. Is ALL of the data in there? Can I be confident that I have all of the data within this file? If not... That's spells out "very bad" for me.
edit: I was doing the export method for the data to a PST originally when I had access to the laptop. But it failed, probably at an estimated 95%? The filesize from what I had seen was about a little over 4.1GB. When I took the OST file, it was 4.8GB, so there is quite a bit of data here for "something." What I had read from another MVP was that backups via that export method were not very reliable, and backups should be taken just from the full original datafile copied elsewhere. Admittedly, I wasn't paying close attention though and I didn't notice until later that this was an OST file. In relation to the PST files, the icon was similar, but the columns weren't expanded enough to show the extension on the file (small laptop screen).