Quick answer: Old app logs are often safe to remove, but active system logs and diagnostic files should be reviewed before deletion.
Why this uses C drive space
Some apps produce huge logs after crashes, sync loops, or installer failures. Logs can explain a problem, so deleting them before troubleshooting can hide useful clues.
Safe cleanup steps
- Sort user folders and app data by size.
- Look for old .log files from apps you recognize.
- Close the app before removing old logs.
- Keep recent logs if you are troubleshooting a crash.
- Use DiskTidy to review large file candidates.
What to avoid
Do not delete Event Viewer logs or unknown diagnostic folders if you are actively troubleshooting Windows problems.
How DiskTidy helps
DiskTidy can help you review temporary files, browser cache, cleanup candidates, and large files before deleting anything. It is designed for local, review-first cleanup instead of blind one-click deletion.