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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It's not that there's anything inherently wrong with this, but it's not the most in line with your goals. If you're worried about data loss, you could have made a volume that spans both drives like RAID1/Z1, or you could have setup some clever data spanning with BTRFS or likewise. Then you'd be killing two birds with one stone for the Timeshift portion.
If you want safe backups, you need a separate backup drive at a bare minimum.
Did you actually test which drive is faster?
It's also likely that the mSATA slot is bottlenecked since it runs at SATA II speeds while the 2.5 bay runs at SATA III speeds. This becomes noticeable with heavy swapping or flatpak updates. I found this out the hard way because I want my boot drive on my 256 GB mSATA instead of the 2 TB SSD that I use for media and backups.
did you end up switch everything to the 2.5 ssd?
I didn't