Time machine can't find backup on external ssd

arystan65 wrote:

I backed up my old Mac to my external ssd and it's almost full, then today i tries to backup it on my new Mac, but it can't find any backup

https://discussions.apple.com/content/attachment/f245131f-39dd-4e91-95d7-52e1528d0122

https://discussions.apple.com/content/attachment/43da3c0a-d0aa-4dac-81d9-8244acf7ecb8

From the TM icon in the upper right menu bar—hold the Option key>" Browse other Backup Disk"

and see if anything further is revealed

If your new Mac inherits your backup history - Apple Support

https://support.apple.com/guide/mac-help/if-your-new-mac-inherits-your-backup-history-mh35732/mac

Trouble Shooting Time Machine

Time Machine troubleshooting on Mac - Apple Support