# 32-bit vs 64-bit

There are two versions of SyncBackPro and SyncBackSE: the **64-bit** version and the **32-bit** version. Unless you are using an old, and now unsupported, version of Windows that is 32-bit, you should use the 64-bit version. Windows 11, and Windows Server, are 64-bit only.

There are important differences between them (explained below). If you are unsure which version to use, you should continue to use the 32-bit/64-bit version you are currently using.

- **Do not use both:** You should not have both the 32-bit and 64-bit versions installed at the same time on the same computer. Having both versions installed will cause issues.
- **Migrating:** To switch from one version to another you should export your profiles, uninstall the old version, install the new version and then import your profiles.
- **Windows:** The 32-bit version can be used on 32-bit and 64-bit versions of Windows. The 64-bit version can only be used on 64-bit versions of Windows. Refer to the [Microsoft documentation](https://support.microsoft.com/en-sg/help/827218/how-to-determine-whether-a-computer-is-running-a-32-bit-version-or-64-bit-version-of-the-windows-operating-system) to see which version of Windows you are using. Windows Server and Windows 11 are only 64-bit.
- **Compatibility**: The 32-bit version is compatible with older versions of SyncBack. This means, if you are upgrading from V7 or earlier, then there will be no issues. The 64-bit version of SyncBackPro cannot use **VBScript** scripting. You must [convert your VBS scripts](ConvertingVBSToBasic.md) to the new Basic scripting language.
- **File System**: When a 32-bit program is used on 64-bit versions of Windows, then Windows [interferes with file system calls](http://support.2brightsparks.com/knowledgebase/articles/215543-system32-copied-files-are-unexpected) to help with compatibility. This means that 32-bit versions of SyncBack will [see different files](https://msdn.microsoft.com/en-us/library/aa384187(VS.85).aspx) in some Windows system folders. If you are not copying system files, then this should not be a problem. If you are, then you should check your profiles [file and folder selections](SubDirectoriesandFiles.md) to make sure the correct files are being copied.
- **Environment Variables**: If you use Windows environment variables, e.g. for a profiles destination, then note that some Windows environment variables will have different values depending on if it's 32-bit or 64-bit Windows. Check the Windows documentation.
- **Scheduling**: The Windows Task Schedules, to run your profiles, are stored in a different folders in the task scheduler. This should not be a problem because SyncBack will import the schedule into the correct task scheduler folder.
- **Benefits**: The major benefit to using the 64-bit version is that it has access to all the memory on your system. This may be important to you when using some [cloud services](Cloud.md), e.g. Dropbox, and [high levels of compression](CompressionSettings.md).
- **Downloading**: See the [downloads page](https://www.2brightsparks.com/downloads.html) for links to the 32-bit and 64-bit versions of SyncBackPro and SyncBackSE.

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