hi ,
if current tvheadend crashed , i suggest you to install a stable version of tvheadend . because different tvheadend use different configuration files .
there is no useful to back up the current tvheadend .
#wget
https://dl.bintray.com/tvheadend/centos/linux/4.2/el7.centos/x86_64/tvheadend-4.2.3-20~g407c8a3.el7.centos.x86_64.rpm#rm -rf /usr/share/tvheadend /usr/bin/tvheadend /root/.hts/
#rpm -e --nodeps tvheadend
#yum install uriparser-devel.x86_64
#rpm -ih tvheadend-4.2.3-20~g407c8a3.el7.centos.x86_64.rpm
#reboot
cesbo's configuration file will also exist after update.
best regards!