My Cloud Mirror - crontab

I needed to setup some entries in crontab. I looked for some solutions and found some. But didn’t like them.
This is my approach (i quite sure it’s nothing new)

as root via ssh:
cd /CacheVolume/
mkdir edit
tar xzf backup.tgz -C edit
cd edit
vi backup/config.xml
tar czf backup.tgz backup/ ./backup.tgz