Outlook always generate the error of “cannot backup large .pst files” or PST size increased/exceeded when the PST size is more than the standard size limit for back up. We assume that large size of PST is the only cause for this kind of error.
Although it is, but not only the large PST size is always the point of conflict, there are a lot of other points too which led Outlook to generate this kind of error. This blog is to fix the error depicting cannot backup large Outlook PST file.
User's issues are often like this: -
“My Outlook is continuously popping error that cannot backup large outlook pst file. There is no space in your external drive to back up the files. But I have 20GB of space in my external storage and the PST I want to backup is of only 5GB. How is this possible? Please suggest a solution for how to backup large PST files.”
Which file system are you using?
The technicality used here is your File system. File system comes with the maximum file size which repel all the files if exceeding its maximum file size. Now it depends on your system that at which file system it works.
FAT32 as this is the general file system tied up with your system. Well if you are using FAT32 then your maximum cluster size is of only 4GB as it is the standard file size limit of FAT file system. There is a DIY solution to this issue, switch your file system to NTFS. Because it supports very large file size, approximately up to 16 billion bytes in file size.
How to convert FAT into NTFS?
Follow the simple procedure to convert your current file system in NTFS: -
Points To Be Noted
Well before switching your File System, read properly the undermentioned points and do follow.
With this manual approach users can easily backup large Outlook PST files by following some useful steps-
Your archive data file is in another location from your PST file. You can open your archive files anytime by importing Outlook Data File in Outlook.
Compact your data file by adjusting the setting
These all measures should resolve your issue. Even if you cannot backup large PST files then refer to next section.
The error "cannot backup large PST files" will get resolved by the above described method and you can copy large PST files easily. Well if your issue persists then I would recommend you to use third party tool i.e. Outlook PST Splitter software. This tool easily split your PST files and backup them. Split PSTs consist the same data but in compressed size so may the size issue get resolved with splitting. You can opt this solution too.