Modify Frequency Related Incremental Backup
Original Publication Date: 2002-Sep-30
Included in the Prior Art Database: 2003-Jun-21
Problem At the moment, backup software clients do not offer a way to backup files selectively based on file modification frequency. That is, it is not possible to specify a backup for files that have been modified >n times over a specific time interval because frequently modified files are at greater risk of being accidentally lost or corrupted and have, as consequence, a higher probability of needing to be retrieved. This problem arises especially in situations in which bandwidth and/or backup windows constraints exist, or where a policy needs to be implemented by which frequently modified files are backed up to fast access media (e.g. disk), while infrequently modified files are backed up to slower access media (e.g. tape). Solution The proposed solution is centred on the creation of a dedicated journal daemon. At the moment, the daemon monitors the journaled filesystem local database for changes since the last backup. To account for the modification frequency count we can modify the daemon to keep trace of how many times a file has been modified since the last backup. According to this frequency number, a specific backup policy will be implemented. Various scenarios are thus enabled: backing up files as soon as they reach a specific modification count, backing up at the scheduled time only those files that have reached the modification count, backing up a specific number of files that have reached the highest modification count or choosing a time interval and backing up those files that have reached a specific modification count in that interval.