My distro hopping and tinkering has slowed way down too, and I also keep a file of basically how I like everything set up in case need be for disaster recovery
I've a script I admittedly haven't used in too long that tar/gzip's the stuff under $HOME I consider either vital or such that it would be painful to re-write.
But I long ago stopped archiving any of the unbelly. I just bring my *.tar.gz wherever I need it, and its content just plain works.