Thanks for the info. I don't recall if Stretch requires module rebuilds on kernel updates but that hasn't bothered me in the past. And I always reboot before re

Thanks for the info. I don't recall if Stretch requires module rebuilds on kernel updates but that hasn't bothered me in the past. And I always reboot before removing old kernels just to make sure that I don't really need them. I'm using ZFS on extra storage - not on /, /boot or /home. On one box I do have a ZFS volume mounted to my ~/Documents directory. I did try to install ZFS on the boot device and after thrashing a bit I decided to wait until the installer supports it. I have a file server and remote file server for backups and I'm preparing upgrades for both that put the served filesystem on ZFS and sends incremental snapshots to the remote to keep it synced. The existing system uses `rsync` to synchronize.