[ubuntu] looking for backup solutions

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http://ubuntuforums.org – I have not attempted a project on this scale until now. I have a number of clients/locations each has two linux computers. Client A has 4 locations Mom and Pop stores Client B has 200 locations Client C has 200 locations Client D has 300 locations Each of them is responsible to local backups(yea right) of all machines(local) to be stored externally. In reality I've had 3 locations suffer HDD failures in the last week, loosing irreplaceable financial data. Goal provided/offered as secure offsite backup. I personally have started doing manual backups of config files only on one machine tot (Hardware)