Easy to see now and my initial suspicion: The DB Versions are growing very fast.
For R77.x see sk31313: Removing all Database Revision Control packages for removal instructions and find more details about database revision in Security Management Server Administration Guide R77 Versions and sk61700: Database Revision Control files
For R80.x see Security Management Administration Guide R80.30 p.292ff on how to reduce them. For Revisions Management in R80/R80.10, refer to sk113615.
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