EV vault stores and indexes backup mode question

Hi

Environment is EV 9.0.2

At the moment, we put indexes and vaultstores in backup mode for the duration of tape backups.

The downside to this is that some of the EV servers have massive indexes, so full backups can run for a long time, and the journal mailbox backs up significantly for this duration.

So I am considering removing the requirement for vault stores to be in backup mode during full backups (still leaving indexes in read only mode), and leaving vault stores and indexes in read only mode during incrementals.

Any caveats with this approach? Am I increasing risk to the environment?

Thanks