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Windows 7: No space for Win7 backup but hdd 70% empty

01 Apr 2010   #1

Win 8 Pro 64 bit OEM
No space for Win7 backup but hdd 70% empty

I have a second internal 250Gb hdd specifically for Win 7 (64bit) backup and restore purposes which I set up about two months ago. The other day I got an alert/warning that there was insufficient space to complete the current background data file backup. In Control Panel\backup & Restore\ Help I learned the following.


By default, Windows automatically saves as many system images as it has space for without taking up more than 30 percent of space on the backup disk. Once the disk starts running out of room, Windows deletes older system images. You can set Windows to retain as many system images as it has space for on the backup disk or to only keep the most recent system image. You should always keep the most recent system image. If you are saving your system image on a network location, you can only keep the most recent system image.


Applied to my case Win 7 will only use max 70Gb of my hdd whereas at the time of the alert, a third 'period' data file backup would have taken me over the arbitrary 70Gb limit although I still had (and currently have) approx 178Gb of free space on the same hdd. Unless, I have overlooked something, there doesn't seem to be any way of over-riding the 30pct max of available free space imposed by Win 7. I know I could buy a much larger second hdd so that the 30pct would represent more backup space but why should I need to.

Any ideas appreciated.


My System SpecsSystem Spec
03 Apr 2010   #2

W 7

maybe I am saying something stupid, but is your drive NTFS formatted?
I had the impression that some formats like FAT32 have a limited "root" for files...

I would truly appreciate if someone could confirm or bust this mith
My System SpecsSystem Spec
04 Apr 2010   #3

Windows 7 x64 pro/ Windows 7 x86 Pro/ XP SP3 x86


If you want more space for storing older images, shadow copy storage area of the target volume would need to be increased. The limit should be able to be changed with either

a) vssadmin Resize Shadowstorage or
b) Control Panel -System -System Protection -configure - Disk space usage.
My System SpecsSystem Spec

04 Apr 2010   #4

Win 8 Pro 64 bit OEM

Thanks very much Bill2! Your b) option did the trick and I've increased usage to 80% which should prevent future, similar back-up issues.

For Highlander, my file system is NTFS. If you Google 'Fat32 file capacity' or similar you will probably find what you need. Or click on the link below.

Is there a limit to what a single folder or directory can hold?


My System SpecsSystem Spec
05 Apr 2010   #5

W 7


thanks for the link, that's exactly what i had in mind, but wasnt sure of the numbers nor how it would apply. I am glad you solved your problem.
My System SpecsSystem Spec

 No space for Win7 backup but hdd 70% empty

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