I first now thought about going for btrfs as a single change in setup to be able to maybe have snapshots. i have started fresh with 206.1 iso, swap, / and /home as both btrfs, and / with snapshots enabled. installed some moments ago, applied the debug setting systemd-analyze set-log-level debug and now zypper dup but only the oss/non-oss (no update repos) enabled to make it work like on release day. will see if i get timeouts around 700+ package# for systemd again. if i can repro with this, then i might try to add the testing systemd repo as a next step (start over again), if not i will revert to ext4 once again and see if i can repro this in a steady stable rate at all. maybe last time it was just luck/random?