rdiff-backup is a popular, free, open source mirroring and incremental backup system for posix based operating systems like linux & Mac OS X. It uses rysnc algorithm through librsync but it doesn't use rsync. The documentation of rdiff-backup focuses on push model for backup where client machines pushes their backup data to backup server. This model is problematic when the backup server is on a well protected secure network behind a firewall. Client machines on external servers cannot easily connect to a machine behind firewall without punching a hole which reduces security of the system. A better alternative is to use the pull model where the backup server requests for backup from client machine, at regular intervals, over secure ssh connection.

After the recent yum update, named failed to load. I tried searching Google without much help. The permissions were all correct and yet named failed to load. And then I found the simple solution.

Sometimes you need to have database column names with space or other non-standard characters. The standard procedure is to escape them with backtick (`) character. HSQLDB doesn't accept either backtick or single quote as escape character. Instead you have to use escaped double quotes as shown in the example below: st.execute("CREATE TABLE sheet (tg_meta_id int identity primary key, tg_meta_batch int, SKU varchar(255), \"Data Source\" varchar(255), \"e-Biz Manager\" varchar(255))"); Actually it accepts double quotes but as it is embedded within a String enclosed in double quotes, you have to escape the double quotes.