Automated Cleanup of Scratch

The scratch space is automatically cleaned up nightly with the following mechanism.

1. Daily snapshots of the scratch folder are created and retained for 3 days.
2. Files which were not modified for the last 14 days are removed.
3. Erroneously deleted files can be manually retrieved from the snapshots.

Warning

We specifically use the mtime attribute to determine if files in scratch should be cleaned up. Copying or downloading files to scratch while preserving the original mtime might lead to unexpected results.