my ios_backup dosen't appear on itunes when I try to backup my iphone

I

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Hello,

When I change the location, after follow your process it works perfectly: there was the alias link on the folder Backup.
Yesterday I try to backup my Iphone via itunes ; new iphone never bascked on this computer was the bad news!!
the allias link move frome Backup, folder empty?!
When I check, at the new place, the folder ios_backup, I can find my first backup with the device's code, and also the last backup I did yesterday...
The backup works butn the link betwin ios_backup and itunes is probably broken...
I dont know how it could happen but its happened...
Soory for my bad english!
thanks by advance
herve

Mac mini 2018 10.14.4