I am quite surprised this thread hasn't received more community attention. Timeshift is perhaps the best application of this sort now available on Linux, and it is an eminently reasonable choice for inclusion as installed by default on the liveUSB, as the Mint developers have done. After all, this allows the live environment to be used as an offline restore disk, which is an incredible feature, and it's incredibly convenient to set up restore points or redeploy preconfigured systems for people with identical hardware. I think the Solus 4 authorities should definitely consider Timeshift installed by default. It's not enough to have it available in the repos for post-installs, since, currently, the official Timeshift installer has dependencies that are inconvenient to install offline. At any rate, it's an excellent well-maintained app for normal every-day usage.