Question:

Thin wasn't used: Failed because first record is later than requested
 
Answer:

Full message: Failed because first record is later than requested

The above message signifies that Digital West Remote Backup THIN technology wasn't used for the specified data path as there was a mismatch between the time stamp the Digital West Remote Backup Executive Client expected and the actual time stamp of the index file that THIN relies on.

This is an automatic process and the next generation of the backup should use THIN technology.