Relocatable user backup (RUB) is the ability to restore or relocate backups to another system or site. It is one of the primary ways to mitigate the threat of service-provider lock-in in a software as a service model. It also provides a backup in the event that the service-provider suffers a catastrophic failure.
The concept requires 3 fundamental components :
The third component also contains the implication that either the application itself is provided with the backup, or there is a consistent and ongoing application upgrade path to prevent the situation where the restore of a RUB is prevented due to an obsolete version of application software.
References
Relocatable user backup Wikipedia(Text) CC BY-SA