Why am I unable to back up my phone any longer?

greenpeg Said:

"Why am I unable to backup my phone any longer?: Since January I have not been able to back up my phone. I have no idea what the problem is or how to fix it.“

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Storage Space:

You may have run out of storage space. So, either use another source for backing up, or delete older backups you no longer need.

Have you followed these instructions?

How to back up your iPhone, iPad, and iPod touch - Apple Support