In my experience, Time Machine is rock solid. I've backed up and restored many times onto new machines and the only thing that it doesn't handle well is Homebrew (or anything in /usr/local). I've had the same macOS installation for about ten years now.
Also, in my experience, Crashplan is a steaming pile of garbage. Are you verifying that your restores are checksum-accurate? Are you verifying that all files are present after a restore? Neither was true for me, and support were unable to help.
With Apple, you can take it to any store and they'll diagnose it immediately. With business support (which isn't even expensive for individuals; it was $500/year when I had it) they'll give you a loaner on the spot.
If you've got backups, your downtime for a dead machine maybe a few hours.
Also, in my experience, Crashplan is a steaming pile of garbage. Are you verifying that your restores are checksum-accurate? Are you verifying that all files are present after a restore? Neither was true for me, and support were unable to help.