If you have temporary (big) data, use the local scratch directories on your computer or every lab machine instead of copying them to your research (or home) folder.
The research and home folders are backupped, so it can take a lot of waste data space if the files are only temporary: they stay in the backup system for a very long time!
Temporary data is data that you have generated, tryouts, big downloads, music, big source code trees (git clones), … anything that you can recover quickly! The default location for the scratch folder is in the root directory /scratch. Use it!