Learn in the textbookPhysical Security Measures
DefinitionRemote backup keeps a copy of the data at a place geographically distant from the main site.
ExplanationA copy kept in the same building can be lost along with the original in a fire or earthquake. With a copy at a distant site, you can restore the data and resume operations after the disaster. Against ransomware (ランサムウェア), which encrypts files so they cannot be used, however, a copy synced over the network may be encrypted too no matter how far away it is, so disconnection matters more than distance.
AnalogyIf you keep precious photos not only at home but also with a relative who lives far away, you can get them back even if your house burns down.
Memory hook"Remote" is about distance. Distance protects against disasters; disconnection protects against ransomware.