03-29-2011
First you need a destination for the backups. Let's say it is /backup. It says "important files" and to me that means you pick and choose. For example, out of /etc, maybe passwd, shadow, group, and hosts. There are probably others but all of /etc sounds excessive. Any of /opt also sounds excessive to me. Once the script is working you can tweak the exact file list. Also the exact list will vary from OS to OS and you haven't told us yours.
So it sounds like you cd to /backup, create etc, cd to /backup/etc and copy the files you pick from etc. And repeat this for other directories that have file that you feel are important. cp has an exit status and you will need to check it to see if the cp was successful.
The script should be run out of cron.
I think that this should give you enough ideas to start your script.
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LEARN ABOUT DEBIAN
svn-fast-backup
svn-fast-backup(1) General Commands Manual svn-fast-backup(1)
NAME
svn-fast-backup - very fast backup for Subversion fsfs repositories.
SYNOPSIS
svn-fast-backup [-q] [-k{N|all}] [-f] [-t] [-s] repos_path backup_dir
DESCRIPTION
svn-fast-backup uses rsync snapshots for very fast backup of a Subversion fsfs repository at repos_path to backup_dir/repos-rev, the latest
revision number in the repository. Multiple fsfs backups share data via hardlinks, so old backups are almost free, since a newer revision
of a repository is almost a complete superset of an older revision.
This is good for replacing incremental log-dump+restore-style backups because it is just as space-conserving and even faster; there is no
inter-backup state (old backups are essentially caches); each backup directory is self-contained. It has the same command-line interface
as svn-hot-backup(1) (if you use --force), but only works for fsfs repositories.
svn-fast-backup keeps 64 backups by default and deletes backups older than these; this can be adjusted with the -k option.
OPTIONS
-h, --help
Shows some brief help text.
-q, --quiet
Quieter-than-usual operation.
-k, --keep=N
Keep a specified number of backups; the default is to keep 64.
-k, --keep=all
Do not delete any old backups at all.
-f, --force
Make a new backup even if one with the current revision exists.
-t, --trace
Show actions.
-s, --simulate
Don't perform actions.
AUTHOR
Voluntary contributions made by many individuals. Copyright (C) 2006 CollabNet.
2006-11-09 svn-fast-backup(1)