Some files are always excluded in backup jobs for devices running the Windows operating system.
(There are no automatic exclusions for other operating systems.)
Default Windows excluded files include:
Axcient-specific files
/axcient
/Axcient
Pagefile and Hybernate files
/hiberfil.sys
/pagefile.sys
System volume information files
/System Volume Information
/SYSTEM VOLUME INFORMATION
Recycle Bin files
/recycled
/RECYCLED
/RECYCLER
/Recycle.Bin
/RECYCLE.BIN
/$RECYCLE.BIN
/$Recycle.Bin
/recycler
Client-side caching files
/Windows/csc
/Windows/CSC
/WINDOWS/csc
/WINDOWS/CSC
Virtualization caching files
/.vdiskcache