Create README.md
add data backup filter

Assume:
1. Data stored in /home/ only
2. Dump (small) DB data per day (or other interval)
add os backup filter

1. ignore any log file by default, put it to /home if want to save
add /etc/conf.d/ipset
rename file, use real name in system
update gentoo/.data-filter, add ubuntu os filter

1. add /usr/local/etc/*
2. add /var/lib/ipvsadm/rules-save
3. backup /etc/
add ubuntu .data-filter, update gentoo