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Nextcloud clients delete files after a storage change?

Files disappear after a mount or sharing change? Pause synchronisation, preserve local copies and establish server and storage state.

Source date: 5 November 2026Editorial team: KAN KAI WORKSEditorially updated:

Quick answer

Client files disappearing after a Nextcloud storage change do not establish complete data loss. A removed mapping, unavailable mount and actual deletion are different states. First pause affected synchronisation and preserve real local versions outside watched directories. Then have the physical storage and original mapping inspected before scans, backup restoration or reconnecting clients introduce further changes to an uncertain dataset.

Source basis: Q1 · Q2 · Q3

Applies to
The report concerns client deletions after an external storage mapping was removed, not a confirmed general Nextcloud defect. Trash is limited; recovery requires matching data, configuration and database.
How to verify the result
Expected files and newest versions are reconciled; one client reconnected under observation proposes only intended changes before additional devices resume synchronisation.
Your first check

Is synchronisation paused while remaining versions are preserved?

After changing external storage or a folder mapping, many files suddenly disappear from synchronised computers. First limit further changes and preserve versions that still exist. Restarting every client in a hurry can propagate an uncertain state to more devices.

What the original report establishes

A public report describes extensive client deletions after an external storage mapping was removed. It does not prove a general Nextcloud deletion defect. Q1 Nextcloud's recovery documentation requires a coherent set of data, configuration and database. Deleted files may be recoverable from trash under applicable conditions, but retention is limited and configuration-dependent. Q2 Q3

Distinguish actual deletion on storage, an unavailable mount and a server mapping that disappeared from the client's view. The visible file list alone cannot decide between them.

Stabilise the remaining data first

  1. Pause synchronisation on affected devices. Include other computers and relevant mobile clients. Retain logs and timestamps rather than immediately removing and recreating accounts.
  2. Preserve local versions separately. Copy remaining files and unsynchronised changes to protected storage outside watched directories. Establish whether they contain real local data or are placeholders only.
  3. Record the change and affected paths. What was removed, renamed or remounted? Capture the time, mount or sharing identity, source path and users affected. A newly created mount with the same name does not necessarily reproduce the original mapping.
  4. Have storage inspected directly. The administrator should establish whether files physically remain and whether the expected device is actually mounted. An empty fallback directory must not be mistaken for the original storage being empty.
  5. Assess trash and backups. Compare preserved versions and backup timestamps. Choose recovery only after identifying complete copies and potentially newer changes. A broad file scan against an unavailable mount is not an appropriate first repair.

Resume synchronisation under control

Prepare the mapping correction or restoration with matching database and configuration. Inspect a small sample and expected file and version counts first. Then reconnect one client under observation and assess its proposed changes. Bring additional clients back only after that reconciliation is understood.

Keep a list of files whose newest version came from a local device rather than the restored server. This prevents a technically successful restoration from silently replacing more recent work.

Frequently asked questions

Are the files lost if the client removed them?

That observation alone does not prove loss. Inspect server storage, the external source, trash, backups and separate local copies independently.

Should I immediately restore an older server backup?

Not without reconciling state and pausing clients. An older server state can displace newer changes. The incident timeline, affected paths, mount configuration and available backup dates are especially useful for a handover.

Help with this case

We can help isolate the affected process and prepare a controlled next step. Discuss case A0248 with KAN KAI WORKS.

Support with this issue

We investigate Nextcloud using your error message, versions and a narrowly scoped example.

Describe your case →Related service: Data & improvements

Sources

Sources checked on 5 November 2026. Individual reports do not establish general prevalence.