windows backup- 2012R2

Hi, i just got a windows backup service running in a server 2012R2. its backing up the hole server for approx 700GB to an iscsi target.
target space is 750GB. backup works one day , next day it fails because of no space.  normally backup service deletes itself the old copy before running the next backup. am not sure why it is not happening in my case. if i delete old backups manually its succeeding next day. then again fails because of no space.
Could anyone help me with this

thank you
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Which backup software are you using? Give your space limitation, you would be best served using a mix of full and differential backups. But in the overall scheme of things, you need t increase the space so that you can properly retain backup data.
Mr.XAuthor Commented:
Windows backup service which comes with sever
Space of my iscsi target 750GB
Server size 700gb .
Doing just full backup
Your whole problem comes out of your target just being too small. You wouldn't be able to actually retain data for more than a day. You need to increase that space.

Your lack of space is why it's failing. WSB wants to at least be able to preserve some of the backups when manning disk space. Your scenario would lead to no backups remaining, therefore the backup fails.

Read up on automatic disk usage management:

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You should have at least twice / thrice disk space of your backup space because 1st new backup will fire, once it successful, then it should have authority to delete old backup
Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

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Windows Server 2012

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