|AFAIK, M$ Backup & Restore are DOS version specific - first thing you'll need to do is determine which yours is.|
Older versions and some info can befound at the Powerload DOS page
DOS is an actual operating system, so, unless you wish to undertake multibooting, you just don't install it onto another OS.
Might be able to use a bootdisk - - you haven't specified where or on what these forgotten backups exist - DOS is not compatible with NTFS partitions - older DOS was FAT16 compatible, 'Windows DOS' (9x - ME) could use FAT32
To do what you want will require no small amount of effort and research - might be further ahead to use an old DOS machine for your purposes (much simpler anyways)
This is probably not the best place to ask about DOS emulation (DOS users have no need)
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.