|Archiving status||Not saved yet|
Several free FLV downloaders and video-to-URL converters exist on the web.
AT rescue projects usually use youtube-dl.
YouTube annotations (speech bubbles and notes) are available as XML
To transform this XML to SRT, use ann2srt
Recomended way to archive Youtube videos
First, download the video/playlist/channel/user using youtube-dl:
youtube-dl --title --continue --retries 4 --write-info-json --write-description --write-thumbnail --write-annotations --all-subs --ignore-errors -f bestvideo+bestaudio/best URL
You need a recent (2014) ffmpeg or avconv for the bestvideo+bestaudio muxing to work. On Windows, you also need to run youtube-dl with Python 3.3/3.4 instead of Python 2.7, otherwise non-ASCII filenames will fail to mux.
Then, upload it to https://archive.org/upload/ Make sure to upload not only the video itself (.mp4 files), but also the metadata files created along with it (.info.json, .jpg, .mp4.annotations.xml and .mp4.description).
Little is known about its database, but according to data from 2006, it was 45TB and doubling every 4 months. At this rate it would be 660 Petabytes (Oct 2014) by now. FYI, all of Google Video was about 45TB. Let's hope it stays healthy, because the Archive Team may have finally met its match.
Will be living off Google for a long time if nothing changes.