... flu ... haven't been doing much.
If you restore rootfs without restoring /opt, you'll have a lot of invalid package metadata. The system will be in an ugly, inconsistent state.
So possibilities include: Only /home/user (ie. just preferences) Only rootfs, /opt rootfs, /opt and /home/user Does that make sense?
I'm not sure if these backups would be compatible with the way BackupMenu works (ie., I think it rm -r's /home before restoring the optfs backup), so it would take some changes to BackupMenu itself before my script could produce anything useful.