Tried it twice in the Archive Finder tool: first time had no hits (and the Wayback Machine timed out), but the second time the Wayback Machine didn't time out and returned a download link for me that included an intact video file.
For this particular video I did find a reupload on Niconico when I was originally searching (https://www.nicovideo.jp/watch/sm11640795, if you're curious) but the archive finder tool is a game-changer.
I do! Just the other day I was trying to find this: https://www.youtube.com/watch?v=__-NKgcRM2c
Tried it twice in the Archive Finder tool: first time had no hits (and the Wayback Machine timed out), but the second time the Wayback Machine didn't time out and returned a download link for me that included an intact video file.
For this particular video I did find a reupload on Niconico when I was originally searching (https://www.nicovideo.jp/watch/sm11640795, if you're curious) but the archive finder tool is a game-changer.
Not archived across the board for a video I tried.