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Let describe this automatic tool by its author, Manuel Iglesias:
(extracted from email exchanges):
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To make it easier to use I have written a shell script with the following
features:
-It assumes all backup files are in an accessible directory. From there
the user can copy them to removable media.
-Easy to configure different backups: Make a copy of the script and edit
'BACKUP SETUP.' in the new file. Configuration file 'darrc' is not
necessary.
-Mounts, makes a backup and then un-mounts filesystems: A mounted file
system could be an external H.D. where the backup files could be written.
-Decides/recommends which backup mode is the most suitable: Create
FullBackup, Rewrite FullBacup, Create DiffNN, Rewrite DiffNN, .......
-Fully automatic: Use '-auto' option to use with cron. I have studied my
system (I am new to Linux :-(.) and cron only sends mail if files in
/etc/cron.{hourly,daily,weekly,monthly} exit with code != 0. I have
written some shell scripts to handle cron jobs.
-Different backups can use the same 'Destination' directory: Backups are
created with base names made up of the shell script name: Shell script
'LoveLettersBackup' creates:
-LoveLettersBackupFull.1.dar
-.......
-LoveLettersBackupFull.N.dar
-LoveLettersBackupDiff01.1.dar
-.......
-LoveLettersBackupDiff01.N.dar
-.......
-LoveLettersBackupDiffNN.N.dar
-LoveLettersBackupDataBase
-Creates and keeps updated a Data Base file for later use by dar_manager.
The backup mode algorithm is the following:
-If there are not FullBackup files then create FullBackup.
-If there are not DiffBackup01 files then create DiffBackup01.
-If the sum of all DiffBackup files is less than %OfFullBackup
(% set in 'BACKUP SETUP.') then rewrite DiffBackup01.
-If the sum of all DiffBackup files is greater than %OfFullBackup
(% set in 'BACKUP SETUP.') then rewrite FullBackup.
-If DiffBackupXX is less than sum(DiffBackup(XX+1)..DiffBackupNN) then
rewrite DiffBackupXX.
------------------------------------------------------------------------------
In my last E-mail I forgot to mention another condition which the backup
mode algorithm takes in account: NrOfDiffBackups.
In the copies of the script I sent you: -If NrOfDiffBackups is greater than
MaxNrOfDiffBackups (set in 'BACKUP SETUP.') then rewrite FullBackup.
In the meanwhile I have decided it is better to rewrite DiffBackup01 in that
situation and I have modified the script accordingly. The backup mode
algorithm is now the following:
-If there are not FullBackup files then create FullBackup.
-If there are not DiffBackup01 files then create DiffBackup01.
-If the sum of all DiffBackup files is less than %OfFullBackup
(% set in 'BACKUP SETUP.') then rewrite DiffBackup01.
-If NrOfDiffBackups is greater than MaxNrOfDiffBackups (set in
'BACKUP SETUP.') then rewrite DiffBackup01.
-If the sum of all DiffBackup files is greater than %OfFullBackup
(% set in 'BACKUP SETUP.') then rewrite FullBackup.
-If DiffBackupXX is less than sum(DiffBackup(XX+1)..DiffBackupNN)
then rewrite DiffBackupXX.
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