Replace both multi-btree-stress-backup.wtperf and evict-btree-readonly-backup.wtperf configurations, as they have problems running with backup.
evict-btree-readonly-backup.wtperf: backup requires writing to a WiredTiger.backup file, thus readonly doesn't work here.
multi-btree-stress-backup.wtperf: direct I/O is not compatible with programs interacting with OS system-level copy functions. wtperf needs to use copy to test backup functionality. Thus direct I/O doesn't work with backup.

The planned configurations that are replaced with are:

• evict-btree.wtperf
• multi-btree.wtperf

This ticket also will analyse the performance of these configurations, and make an small change to the backup_intervals inside 500m-btree-50r50u-backup.wtperf, to perform backup every 30min rather than 5min.