Split files to parts or equal sizes and then stitch them back

split_join_files.md

Split a tar/zip file to multiple parts of size 1GB

split -b 1024m filename.tar.gz 'filename.tar.gz.part-'

Combine the split files to a single unit

Linux

cat filename.tar.gz.part-* > filename.tar.gz 

Windows

copy /b filename.tar.gz.part-aa + filename.tar.gz.part-ab + filename.tar.gz.part-ac filename.tar.gz

or

copy /b filename.tar.gz.part-* filename.tar.gz