I have SVN repository at /var/svn, and folder /var is backup incrementally everyday by the standard TSM backup. Do I still need to do the dump backup for SVN?
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When it comes to SVN repos, which are generally very important and somewhat touchy... you can't be too careful.
I'd suggest having a routine svn dump and if the svn repo is even moderately active, I'd suggest an svn mirror via svn sync. A mirror will give you faster failover and recovery with less chance of data loss, assuming you're running the sync command every minute or so. Backing up svn specifically/separately and verifying those backups on occasion will save you a lot of headache some day.