Keeping backup equipment?

If you run tube gear, as i do, it is quite nice to have a backup ss amp around for a couple of reasons, 1) The ss sound is a different 'flavor' to the tube sound and 2) if the tube amp needs service, the ss amp is there.

I keep a PS Audio Stellar Gain Cell DAC and NAD M22v2 amp as backup to my main system.  Over the last year, I've used them at different times when I sent in my BHK pre amp and BHK 250 amp for service.  

The M22v2 sounds pretty good in my main system; the Stellar DAC sounds OK but the SQ is no where near the BHK pre amp.  At some point, I plan to buy a decent pair of speakers to pair with them.

The only reason I keep so called "back ups" is so when I’m sick of something I can just readily grab something else that is put away and install it. Prevents buying more crap and tossing away more money. Always have some "back ups". To be honest, I do not look at what is stored away as a back up. Instead, I look at these things as stuff I love equally as well as what is currently being used. They only make certain models for so long, then you gotta buy them used. Then who knows what your getting. At least I know my stuff was treated well. I've often sold things I wish I hadn't. I stopped making that mistake. 

I have stuff I haven't gotten around to selling.  Just realized I have basically another system worth of electronics that I should sell - server, preamp, monos, and dac.  I also have an extra set of speakers I will probably keep.  I recommend you sell your  Schiit - while good amplifiers generally hold value, dacs and servers not so much, due to the fast-moving changes in the area of digital electronics.