illustrate
dump command is used to backup ext2 or ext3File system. You can back up a directory or the entire file system to a specified device, or back up to
A large file.
grammar
dump(Options)(parameter)
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Options
-0123456789: The level of backup;
-b<Block size>: Specify the size of the block, in KB;
-B<Number of blocks>: Specify the number of blocks to backup volume;
-c: Modify the density and capacity of the backup tape preset;
-d<density>: Set the density of the tape. The unit is BPI;
-f<Device name>: Specify the backup device;
-h<Level>: When the backup level is equal to or greater than the specified level, the file marked "nodump" will not be backed up;
-n: When the backup work requires the intervention of the administrator, issue notifications to all users in the "operator" group;
-s<Tape length>: The length of the backup tape, in feet;
-T<date>: Specify the time and date of backup;
-u: After the backup is completed, record the backup file system, level, date and time, etc. in /etc/dumpdates;
-w: Similar to -W, but only displays files that need to be backed up;
-W: Displays the file that needs to be backed up and the level, time and date of the last backup.- 1
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parameter
Backup source: Specify the file, directory, or file system to be backed up.
Example
Back up all contents of the /home directory into the /tmp/ file, with the backup level of 0 and
Record relevant information in /etc/dumpdates:
dump -0u -f /tmp/ /home
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Back up all contents of the /home directory to the /tmp/ file, with the backup level of 1 (only backup the last used tier
Time 0: The data that has changed after backup) and record relevant information in /etc/dumpdates:
dump -1u -f /tmp/ /home
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Through the backup level of the dump command, complete + incremental backup, complete + differential backup can be achieved, in cooperationcrontabCan achieve unmanned value
Keep the backup.