Yeah that's true. That's where the "largely" part of my comment does some work. I just take occasional snapshots before I do things that I'm concerned may be c

Yeah that's true. That's where the "largely" part of my comment does some work. I just take occasional snapshots before I do things that I'm concerned may be catastrophic. But it definitely won't catch everything. It helps that I run Arch, and I update packages once a day, which only leaves me with under 40 (small) packages usually. So a quick cursory glance at which ones are updating usually tells me what to be cautious of. Display driver update, kernel update, etc. If I'm not sure what went wrong, but I at least have a working snapshot, then I can get done what I need to get done, and then go back to troubleshooting. Rather than just having a broken system regardless.