I've been running Sooloos Core on my QNAP TS-453A. It's over 15 years old and had a couple of scares recently with power outages. It took a while to fix the network and brought it back to life. I'd like to set up a backup system for Sooloos in case the QNAP motherboard fried. I have Roon; it supports Tidal and has a lot of useful features, but still find Sooloos much more responsive, cleaner and can run without internet connection. I'm also emotionally attached to my Sooloos library since I spent many hours building it and grooming the metadata database.

Any suggestions on current QNAP models that is comparable to the TS-453A and how to install the old QTS version on the new device to run Meridian Sooloos?

C15, QNAP TS453a, 218 (3u), MS600, Roon Nucleus+ 4TB SSD
2Ch: Devialet 250 PRO, Focal Scala, Velodyne DD10+ (2u), PS Audio P12, Transparent MM2
HT: Anthem 1140 & 540 8K AVR, Panasonic BD, 7.2: Triad & DD10+
JVC RS4300, Stewart 110" screen,
House: Triad Amps, Sonance speakers, PS Audio P10