Maybe before you get into the technical aspects, there's another consideration. Out of that 23TiB, are you able to estimate how much of a problem it would be, if you lost some or all of it? e.g.
* disastrous
* very upsetting
* disappointing
* meh
(It might also help to consider when you last needed to access any of it?)
Because honestly, my bet (without judgement) is that there's likely a significant amount of data in there that simply doesn't warrant keeping. I base this on my own habits (I have to actively fight a hoarding tendency digitally and in real life) and also knoweldge of friends who (while otherwise very well adjusted) seem to find digital hoarding easy to fall into - maybe because it has less of a visible life impact than physical belongings.
* disastrous * very upsetting * disappointing * meh
(It might also help to consider when you last needed to access any of it?)
Because honestly, my bet (without judgement) is that there's likely a significant amount of data in there that simply doesn't warrant keeping. I base this on my own habits (I have to actively fight a hoarding tendency digitally and in real life) and also knoweldge of friends who (while otherwise very well adjusted) seem to find digital hoarding easy to fall into - maybe because it has less of a visible life impact than physical belongings.