I'm currently unable to backup via Time Machine, as backups fail with the following error message:
"Time Machine couldn't complete the backup to "Time Machine"". "The backup disk needs 4.50 PB for the backup but only 337.69 GB are available. Select a larger backup disk or make the backup smaller by excluding files."
If I go into Time Machine Options, the estimated size of a full backup is 266.14GB. The source volume is only 500GB.
Things I've tried already:
- running Disk Utility First Aid on both the boot volume (the one to be backed up) and the Time Machine disk
- restarting the Mac
- checked the Time Machine disk is included in the "Exclude the items from backups". It is.
Does anyone know why Time Machine might be massively over-estimating the size required to complete a backup?
4.50 PB is 4,500 Terrabytes, right?!
- I'm using macOS 10.14.3 (up to date as of the time of writing)
- the boot volume is APFS (Encrypted)
- the Time Machine Volume is Mac OS Extended (Journaled, Encrypted)