NAS
NAS migration without data loss
A NAS migration is not just a copy job. It is a sequence: inventory, copy, verify, backup, then retire the old path.
Best for: People moving from external drives, cloud-only folders, or an older NAS.
Inventory before moving
- List source folders, sizes, owners, and what cannot be replaced.
- Identify which source is currently the best copy.
- Do not erase old drives just because the first copy finished.
Copy and verify
- Copy in batches that are easy to check.
- Open a sample of important files from the NAS destination.
- Check counts, sizes, and any copy errors before moving to the next batch.
Retire old storage slowly
- Keep the old drive or old NAS untouched until the new NAS has a backup.
- Run one restore check from the new backup path.
- Only then decide what can be wiped or repurposed.
What should I check first?
- Which copy is currently best.
- Whether the destination NAS already has redundancy and backup.
- Whether the migration has enough free space.
What is safe to try?
- Copy, verify, then backup before deleting anything.
- Use read-only access to old sources where practical.
- Keep migration notes with paths and dates.
When should I stop?
- Stop if a source drive disconnects, clicks, or asks to format.
- Stop before wiping any source without an independent backup.
Last reviewed
2026-05-06