Open computer files snapshot

Details Open computer files snapshot Open computer files snapshot

2007-08-30

2010-11-16

Thai, Tuan V. (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S100000, C711S154000, C711S169000, C707S609000

Reexamination Certificate

active

07836267

ABSTRACT:
A method for backing up a computer-readable data file with a computerized backup application, where the data file is open and locked for exclusive access by an owning application that is mutually independent of the backup application. The backup application by-passes the lock on the data file. Any write operations to the data file by the owning application are intercepted and delayed. The address range of any write operations directed to the data file by the owning application during the backup procedure are written to a change log file, where the change log file contains no indication of the content of the write operations. At least a portion of the data file is copied to a backup file, and any intercepted and delayed write operations are passed on to the data file after the data to be overwritten has been copied to the backup file.

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