when backup disk is full
When backup disk is full, I thought Time machine will automatically deleted oldest backup to make room, but it is not doing it. And keep asking to find a different disk. Please advise!!
Mac Pro, macOS 10.15
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It does, and probably is, but the bottom line is that if TM says it needs more space, then it needs more space.
The solution is to obtain a bigger TM backup drive. Or, erase the one you have and start a new set. You should probably get a bigger backup drive first though, because you never want to be without a backup for even a short period of time.
One common reason for running out of space is that TM backups created prior to upgrading to Catalina are essentially archived and are no longer updated.