How to get rid of message "Backup disk not available"?

I use an external disk for Time Machine.
I switch the disk on every couple of days. In the mean time, I get a warning message every hour that:
"Time Machine could not complete the backup, The backup disk is not available".
How can I get rid of this message? It is really becoming irritating.
Patrick

patrick Wursteisen wrote:
I switch the disk on every couple of days.
that kind of beats the purpose of TM backups, which are usually happening on an hourly basis. if you intend to continue this way, you might as well forget about TM and rather create a bootable clone of your startup disk every couple of days. Carbon Copy Cloner or SuperDuper will even allow you to do incremental clones.
another option would be to change the frequency of TM backups using _*Time Machine Editor*_.
happy computing !
JGG

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