To Add Marianne's post.
Once the drive replaced, Check the serial number whether it's new or old.
In case if it shows old serial number, just make the drive offline and then bring it online.
Eg :
ACSSA>dismount
ACSSA>drive
ACSSA><drive id>
ACSSA>(...
Out put:
1. vssadmin list provider
2. vssadmin list writers
create bpfis log directory on client and rerun the backup ONLY for VSS (exclude other FS)
post output and logs.