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Good suggestions so far, but i see a problem in ftp'ing your updates to another server. When someone hacks your A-Box he has the ftp login to B-Box too - so if he wants to fuck you - he can - by deleting both your primary data AND your backup ...
More secure solution would be to put the backup tar/zip files in a folder like /backups123/ on A-Box, password protect it by htaccess and downloading it with wget from B-Box. This way, even if one person gets access to A-Box or B-Box he doesn't have a login to the other one (except for the htaccess, but nothing he can do there except downloading the backups...)
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