I just had another look at the policy output in your posts above.
You show 2 outputs for the same policy name, but the Backup Selection is totally different.
Why is that?
In both outputs, the same databases appear multiple times. Why is that?
In 1st policy output, we see the following:
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\MG
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\MG
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\MS
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\MS
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\VP
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\VP
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\MG
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Microsoft Exchange Database Availability Groups:\DADAG.dca.com\Microsoft Information Store\US
Here we see 3 entries for MG, 2 entries for MS, 8 entries for US, 2 for VP.
The second output for the same policy name shows totally different database names, again same dbs specified multiple times (Here I have only copied the db names at the end of the path):
MGTD
MGTD
MSCD
MSCD
USRD
USRD
USRD
USRD
USRD
USRD
VPSD
VPSD
MGTD
USRD
USER
Please help us understand what is going on here?
You will agree that NBU upgrade did not do this all by itself, right?