Sorry Till even that wasn't work in any means! SO I re-installed Debian, now 7.3 and ISPConfig. Just an hour ago I was ready with the Main and Mail Server. Mail is now working again. Fine tuning has to start up now. I still have the old installation because I used a new HDD for the new install. So, if I've time I'll play with that a bit around!! Now the question again: What Backup Apps you suggest? I have Acronis True Image Echo 9.7 Build 8206 Enterprise Server with Universal Restore which works for either Windows and Linux. Any experiences with that? Thanks.
backup My experience by your question says your experience may have to pay somewone to teach you. Just kidding use resync.
you may use any kind of backup software that supports linux, there is nothing ispconfig specific regarding linux backup. like atento mentioned, you can use rsync, but also tar, duplicity, tartarus or others will work. If you have acronis and are familar with it, then use that. The best choice is the softare that you are already familar with as this will help you to use it in case of a disaster recovery.