if you back up a region 1 dvd will the back up be region 1 or 2 or multi region ?

Most likely multi-region (provided you’ve made the appropriate settings on the ripper). This is the default anyway for the most popular ripper: DVD Decrypter.

Note that the copies will still be the same standard: NTSC or PAL - whatever the original was. So with some older TVs you might still not be able to play them properly if the standard is not matched, even though there is no longer any regional block. Newer TVs and players should be fine.