Hi,
MSDP has itself's database and other meta data.
I even decreased it to 5%, but backup job failed with data checksum error.
After resume it to 10%, backup job can run successfully.
The behavior is expected!
If the Windows volume is not NTFS or ReFS, and the volume has no full backup schedule that is configured with the Accelerator forced rescan option, NetBackup uses Accelerator forced rescan on every full backup.
You should ...
Yes, NBU 761 can support Mac OS X 10.10 (Yosemite) as backup client.
And, you can find all Compatibility Lists here: http://www.symantec.com/docs/TECH59978
All the supported master, media servers and clients are listed in the docs.