Keep the trial manageable
Fictional example: Aylin backs up her documents regularly but cannot remember how to retrieve them. She creates a text file containing “My backup test” and a date. She waits until she can confirm that a completed backup includes it. A transfer still in progress is not yet a finished test collection.
Aylin wants to retrieve only this file. She does not need a complete system recovery. She keeps the original and plans a separate destination folder so that she can compare both versions afterwards. The aim is to learn the recovery route, not to create a real emergency.
Select the right backup first
Open the familiar backup application and find its instructions for individual files. Check the name of the backed-up device, selected folder and backup time. When several old drives are available, these details prevent you from testing the wrong collection or an outdated copy without realising it.
If the backup requires a key or password, that access must work. Keep such secrets protected and do not place them in a public test log. Being unable to open the backup is already a specific problem worth resolving before you actually need its contents.
Choose a separate destination
Where supported, restore into a new folder or under a different name. Read every prompt about replacing existing files. Do not confirm a full recovery, formatting or deletion when you only intend to test one file. A familiar-looking confirmation button does not make the operation appropriate.
Some applications restore items to their original location by default. If you cannot identify a safe way to obtain a separate copy, stop and consult the relevant manufacturer instructions or a suitable professional. Important documents should not become experimental material for an unfamiliar command.
Open and compare the recovered file
Open the restored file in its usual application. Compare its contents with the test text you recorded. For a photograph, inspect the complete image; for a document, also check the page count. A filename appearing in a folder does not establish that the contents are readable and correct.
Distinguish the content’s modification date from the time the file was restored. A new file timestamp does not automatically mean the saved contents are wrong. The practical question is whether you retrieved the version you actually intended to recover.
Record a finding, not a guarantee
Note the test date, backup selected, file type, destination and result. “Opened one text file from Tuesday’s backup” is more precise than “everything safe”. A successful individual test does not establish that every folder was included or that every file remains intact.
If something fails, note the exact message without sharing personal information it may contain. Avoid changing several settings at once. The Swiss National Cyber Security Centre recommends regular readability and recovery checks. Repeat a suitable test particularly after changing the backup application, device or storage medium.
Your checklist
The checkboxes are for your own reference. No entries are sent to us. To keep a copy, print the page or save it as a PDF using your browser menu.
Common questions
Must I delete the original first?
No. A separate-destination test can demonstrate recovery without risking the original. The available options depend on the application.
Does one successful test prove the entire backup works?
No. It checks a particular collection and file type. Completeness, other formats and other recovery points require further checks.
What should I do with an error message?
Record the step and message, consult the manufacturer’s help and seek support if needed. Do not spontaneously erase or format the backup medium as a repair attempt.
Sources and further information
Primary sources from public authorities, consumer organisations and providers. A source may be in another language; follow the guidance that applies to your service and where you live.
- BACS: Datensicherung und Wiederherstellung testenSource review date:
- Apple: Mit Time Machine ein Backup eines Mac erstellenSource review date:
