There are many ways to backup an Ubuntu installation. The most important thing about backups is to develop a backup plan consisting of what to backup, where to back it up to, and how to restore it.
It is good practice to take backup media off-site in case of a disaster. For backup plans involving physical tape or removable hard drives, the tapes or drives can be manually taken off-site, but in other cases this may not be practical and the archives will need copied over a WAN link to a server in another location.
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