Hello,
You can use the incremental backup method. However when it comes to restoring, you will need to restore every incremental backup set.
For more information on how incremental and differential backups work, refer to the following technote:
Title: What are the differences between Differential and Incremental backups ?
http://support.veritas.com/docs/230247
If all the files are being backed up in either of the two methods, it could be that some other application is changing the archive bit of the files in question. Refer to the following technote:
When running a Differential or Incremental backup job, all files are backed up as if a Full Backup was run.
http://support.veritas.com/docs/190786
Hope that helps. If the issue persists, revert with details.
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Regards.