I loss my backup file & macos sierra

If you’ve lost your backup file and are still on macOS Sierra (10.12), here are some practical recovery options depending on your situation:

1. Check for Local Backups

Time Machine:

If you ever used Time Machine, plug in the backup drive and open Time Machine > Enter Time Machine. You can restore individual files or the entire system.

iCloud Drive:

Check Finder → iCloud Drive or log in to iCloud.com to see if the file is synced there.

2. Use Data Recovery Software

If the backup was deleted or lost from a local drive, you can try recovery tools compatible with macOS Sierra:

• Disk Drill for Mac – widely used and works on older macOS versions.
• EaseUS Data Recovery Wizard for Mac – supports Sierra.
• PhotoRec (free, open-source, but technical).

3. Look for Auto-Backups or Hidden Copies

Some apps (like iTunes, Mail, or Photos) make their own backups:

~/Library/Application Support/ – may contain app-specific backup data.

~/Library/Preferences/ – sometimes includes configuration or partial backups.

If it was a Time Machine sparsebundle, search for *.backupdb in Finder.

4. Re-Download macOS Sierra (if you’re reinstalling)

Apple has removed some old macOS versions from the App Store, but you can still get official installers:

Official Apple support link: Download macOS Sierra 10.12

(if still available).

If the link doesn’t work, you may need to:

Download macOS High Sierra instead (still compatible with many older Macs).

Create a USB installer using Terminal:

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia \

--volume /Volumes/MyUSB

Thanks

Try this:

https://mrmacintosh.com/fixed-an-error-occurred-while-preparing-the-installation-macos-sierra-recovery-error/

But AFAIK all Macs that support Sierra, support also High Sierra which I would prefer.

So try this:

https://mrmacintosh.com/how-to-fix-the-recovery-server-could-not-be-contacted-error-high-sierra-recovery-is-still-online-but-broken/