We have ~ 2TB full exchange backup and it takes ~ 20 hours. There is exch
db consistency check before backup which takes considerable amount of time.
It can be switched off... but it is not recommnded....

On Monday, 23 February 2015, John Keyes <rakyr AT gmx DOT net> wrote:

> Hello fellow TSM Admins!
>
> I'm struggling with Exchange Backup which over the course of the last few
> Days (mainly since the last full backup this weekend) takes about 3-4 times
> as long as before.
> We have Exchange 2013 DAG with 48 Databases and a dedicaded VM to do the
> Backups (Flashcopy Manager 4.1.1, Backupdestination=local, on an IBM V7000
> Storage).
> Right now even an incremental backup of 1 database takes ~12 minutes, but
> the volume is only 30GB big and has only 5GB (5000 x 1MB Files) on it. Two
> weeks ago this would only take 3 Minutes.
> A Full backup takes about half an hour (so I couldn't even complete a full
> backup for every database in one day). I also tried to full-backup the same
> database twice right after one another, with no difference.
>
> This can hardly be normal, can it? Has anyone had the same problems and
> maybe could point me in the right direction?
> Also it would be great if anyone could share how much time their backups
> take...
>
> Best regards,
> John
>